AT COMM CORP
S-3, 2000-05-08
PREPACKAGED SOFTWARE
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             As filed with the Securities and Exchange Commission on May 8, 2000
                                                           Registration No


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    FORM S-3
                             REGISTRATION STATEMENT
                        Under the Securities Act of 1933

                               At Comm Corporation
             (Exact name of Registrant as specified in its charter)



                Delaware                                95-3824750
    (State or other jurisdiction of                  (I.R.S. Employer
     incorporation or organization)               Identification Number)


                        577 Airport Boulevard, Suite 700
                          Burlingame, California 94010
                                 (650) 375-8188

    (Address, including zip code, and telephone number, including area code,
                  of Registrant's principal executive offices)

                               William H. Welling
                          President and Chief Executive
                                     Officer
                               At Comm Corporation
                        577 Airport Boulevard, Suite 700
                          Burlingame, California 94010
                                 (650) 375-8188

            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:

                           Blair W. Stewart, Jr., Esq.
                        Wilson Sonsini Goodrich & Rosati
                            Professional Corporation
                               650 Page Mill Road
                            Palo Alto, CA 94304-1050
                                 (650) 493-9300



Approximate  date of  commencement  of proposed  sale to the public:  As soon as
practicable after the effective date of this Registration Statement.

If the only securities  being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, check the following box. [ ]

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  registration  statement  number of the  earlier  effective
registration statement for the same offering. [ ]

If this Form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

If delivery  of the  prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box. [ ]


<PAGE>
<TABLE>
<CAPTION>
                                                   CALCULATION OF REGISTRATION FEE
====================================================================================================================================
                                                                                                 Proposed
          Title of Each Class                     Amount                  Proposed               Maximum              Amount of
           of Securities to                        to be                   Maximum              Aggregate           Registration
             be Registered                      Registered             Offering Price            Offering                Fee
                                                                        Per Share(1)              Price
                                         -------------------------------------------------------------------------------------------
<S>                                            <C>                         <C>                  <C>                  <C>
Common Stock

$0.01 par value, 1,020,000 of which
are issuable upon conversion of Series         1,020,000(2)                $28.25               $28,815,000          $7,607
B Preferred Stock....................
====================================================================================================================================
<FN>
(1)      Estimated  solely  for the  purpose  of  computing  the  amount  of the
         registration fee pursuant to Rule 457 promulgated  under the Securities
         Act of 1933.

(2)      In the event of a stock split,  stock  dividend or similar  transaction
         involving  our  common  stock,  the  number of  shares of common  stock
         registered  hereunder  shall be  automatically  increased  to cover the
         additional  shares that would be issued, in accordance with Rule 416(a)
         promulgated under the Securities Act of 1933.
</FN>
</TABLE>

         The Registrant hereby amends this  Registration  Statement on such date
or dates as may be necessary to delay its  effective  date until the  Registrant
shall file a further amendment which specifically  states that this Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the  Securities  Act of 1933 or until the  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.
================================================================================

<PAGE>


                                   PROSPECTUS

1,020,000 Shares of Common Stock
($0.01 Par Value)

                                                At Comm Corporation
                                                577 Airport Boulevard, Suite 700
                                                Burlingame, California 94010
                                                (650) 375-8188

         The shareholders of At Comm Corporation,  (formerly Xiox  Corporation),
listed on page 9 are selling up to  1,020,000  shares of common stock under this
prospectus. We will not receive any part of the proceeds from this offering.

         Our common stock is quoted on the Nasdaq  SmallCap Market and is traded
under the symbol  "ATCM." On May 3, 2000,  the  average of the high and low sale
prices of one share of our stock on the Nasdaq SmallCap Market was $28.25.

         These  securities  involve a high  degree of risk.  See "Risk  Factors"
beginning on page 4.


These  securities  have not been approved or  disapproved  by the Securities and
Exchange  Commission or any state  securities  commission nor has the Securities
and  Exchange  Commission  or any state  securities  commission  passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.


         The date of this Prospectus is May 8, 2000

<PAGE>


                About At Comm Corporation ("At Comm" or "@Comm")
                           (formerly Xiox Corporation)

         At Comm  Corporation  was  originally  incorporated  in  California  in
September 1982, subsequently  incorporated in Delaware in April 1987, and became
a publicly held company in February  1986.  Our stock is traded under the symbol
"ATCM" on the NASDAQ exchange.

         We design,  manufacture,  and distribute a wide range of telemanagement
systems and  solutions for the small and medium sized  business and  hospitality
markets. We design, develop,  manufacture and sell software and hardware systems
under our Xiox  Telemanagement  Systems brand that assist  companies in managing
their  telecommunications  expenses.  These software and hardware  solutions can
operate on  personal  computers,  local area  networks  and Xiox  hardware.  Our
systems are designed to efficiently provide information to facilitate  telephone
expense  control;  client,  department  or project  billback;  and fraud control
prevention. These systems can meet the simple needs of a 25-person office or the
complex needs of a multi-site Fortune 500 corporation.

         Since our incorporation,  our Xiox Telemanagement  Systems product line
has expanded from a single software system to a full range of  telecommunication
systems,  each of which has been designed to address the needs of small or large
businesses  in many  different  industries.  In  addition  to our  software  and
hardware-based  systems,  we also  provide  call  costing rate tables and system
enhancements to end users under subscription arrangements.

         We market our Xiox telemanagement systems through a direct sales force,
dealers,   subsidiaries  of  regional  bell  operating  companies  and  original
equipment  manufacturers.  Together  with our dealers we have sold and installed
over 30,000 systems.

         In  May  2000,  we  announced  the  introduction  of  our  Town  Square
Communications  Systems  product  line.  This new  product  line is  designed to
provide  integrated  voice,  data and Internet  access to small and medium sized
businesses  in a cost  effective  manner.  The new  product  line  will  combine
telephone,  data, and Internet connections in a single system, providing private
telephone exchange, voice mail, automatic attendant,  local area network control
and network security functions.  We believe that small and medium sized business
customers will benefit from our new product line through telecommunications cost
savings and the ease of installation and use of the new products.

         We will market our Town Square  Communication  Systems  through dealers
and subsidiaries of regional bell operating companies.

We have  secured  trademark  protection  for our  service  marks  under our Fort
Knox(R) Family of products,  including  Fort Knox(R),  Hacker  Tracker(R),  Xiox
Hacker Tracker(R),  Hacker  Preventer(R),  and Hacker Deadbolt(R).  We also have
trademark protection for Prophet Writer(R),  Summa Pro(R), Summa Suite(R), Summa
Voice(R), and our window and curtain graphic logo. XioxTM is also our trademark.
We have pending and in good order before the United  States Patent and Trademark
Office applications for registration for the following marks: Paix,  Intelligent
Buffer, Appliance, Appliance One, Appliance I, Appliance II, Appliance III, Town
Square,  Town Square and design,  @Comm and design.  We have pending and in good
order regional applications for trademark registration in Belgium,  Netherlands,
and  Luxembourg  for the  following  marks:  Town Square,  Town Square + device,
@Comm,  and ATCOMM.  We have pending and in good order  application for European
registration of the following marks: @Comm and Town Square + device.


                                       1
<PAGE>


         Our address and telephone number are: At Comm Corporation,  577 Airport
Boulevard, Suite 700, Burlingame, California 94010, (650) 375-8188.

                                  The Offering

         This  prospectus  relates to the sale of up to 1,020,000  shares of our
common stock by the selling shareholders named on page 9 below.


                                       2
<PAGE>


                           FORWARD LOOKING STATEMENTS

         This  Prospectus,  including,  but not  limited  to the  section  below
discussing risk factors,  as well as the  information  incorporated by reference
herein, contains forward-looking statements within the meaning of Section 27A of
the  Securities  Act and Section 21E of the Exchange Act.  Actual  results could
differ  materially from those projected in the  forward-looking  statements as a
result of many factors, including the risk factors set forth below.

         You can identify such  statements by noting the use of  forward-looking
terms such as  "believes,"  "expects,"  "plans,"  "estimates"  and other similar
words. Certain risks, uncertainties or assumptions that are difficult to predict
may affect such  statements.  The  following  risk factors and other  cautionary
statements  could cause our actual operating  results to differ  materially from
those expressed in any forward-looking statement. We caution you to keep in mind
the following risk factors and other  cautionary  statements and to refrain from
placing undue reliance on any forward-looking statements, which speak only as of
the date of this document.

         Reference is made in particular to the forward  looking  statements set
forth under  "Management's  Discussion  and Analysis of Financial  Condition and
Results of  Operations"  in the Annual Report on Form 10-KSB for the fiscal year
ending December 31, 1999, and the quarterly reports on Forms 10-QSB and 10-QSB/A
for the quarters  ending March 31, 1999,  June 30, 1999, and September 30, 1999,
as well as all other  documents  filed after the date hereof by At Comm,  all of
which  are   incorporated   herein  by  reference.   In   connection   with  the
forward-looking statements which appear or are incorporated by reference herein,
prospective  purchasers  of the common stock  offered  hereby  should  carefully
consider  both the factors set forth  below  under "Risk  Factors"  and the risk
factors described in the documents incorporated by reference.


                                       3
<PAGE>


                                  RISK FACTORS

         Before  you  invest  in our  common  stock,  you  should  be  aware  an
investment  in our common stock  involves a high degree of risk,  and that there
are  various  risks,  including  those  described  below.  You  should  consider
carefully  these  risk  factors,  and the  other  information  included  in this
prospectus before you decide to purchase shares of our common stock.

Differing sales cycles may cause our operating revenues to fluctuate,  which may
lower our stock price.

         Our  quarterly  revenues are likely to fluctuate  significantly  in the
future  due to a number of factors  that  affect  telecommunications  management
companies,  many of which are outside our control. Factors that could affect our
revenue include:

o        variations in the timing of orders and shipments of our products;
o        variations in the size of the orders for our products;
o        new product introductions by our competitors;
o        delays in introducing new products.

Our stock price may be volatile and you may not be able to sell the shares at or
above the price you paid to purchase them.

         The trading price of our common stock may be highly  volatile and could
fluctuate  in  response to a variety of factors  that affect  telecommunications
management companies, including the following:

o        actual or anticipated variations in quarterly operating results;
o        announcements of technological innovations;
o        new products or services offered by us or by our competitors;
o        additions or departures of key personnel;
o        changes in financial estimates by securities analysts;
o        conditions or trends in the telecommunications industry;
o        changes in the economic  performance  and/or  market  valuations of the
         telecommunications industry;
o        changes in the economic  performance  and/or market valuations of other
         companies in the telecommunications industry;
o        volatility generally associated with technology stocks; and
o        other broader market trends unrelated to our operating performance.

         In addition,  our stock is commonly  described as "thinly traded stock"
because our average daily trading  volume  (approximately  3,000 shares) is very
low in  comparison to other  publicly  traded  companies.  The price of a thinly
traded  stock  like ours may  fluctuate  sharply  whenever  the volume of trades
exceeds the average  volume.  The dollar amount of the trades that would trigger
those  fluctuations is low in comparison to the dollar amount that would trigger
similar  fluctuations  in the stock  price of  companies  with a higher  average
trading volume.

If we do not keep pace with rapid  technological  change,  we may not be able to
produce new products and remain competitive.

         The software industry is characterized by rapid technological change as
well as changes in customer  requirements  and  preferences.  In order to remain
competitive in this industry, we must quickly respond to such changes, including
the enhancement and upgrading of existing  products and the  introduction of new
products.  We believe  that our future  results  will  depend  largely  upon our
ability  to offer  products  that  compete  favorably  with  respect  to  price,
reliability,   performance,   range  of  useful  features,   continuing  product
enhancements, reputation and training.


                                       4
<PAGE>

We cannot  assure you that a market  for our Town  Square  Communication  System
product line will develop.

         Although  we  believe  that our Town  Square  family  of  products  and
services,  which combine voice, data, and Internet communications services, will
provide  our small and medium  enterprise  and branch  office  customers  with a
cost-effective,  adaptable solution to their telecommunications needs, we cannot
assure you that a market for our equipment and services will develop.  Among the
factors which may impede market acceptance of our equipment and services are:

o        pricing competition from our competitors;
o        quality and reliability of our Town Square hardware and software;
o        possible advances in technology by our competitors; and
o        consumer awareness of our Town Square Communication System product line
         as an acceptable,  low-cost  alternative to traditional  voice and data
         network systems.

Most of our  competitors  have  more  resources  than we do,  which may harm our
ability to compete effectively with them.

         Most of our competitors,  as well as many potential  competitors,  have
substantially greater financial,  marketing and technology resources than we do.
Telco  Research,  ISI-Infortext  and Nortel  Networks  Corporation are our major
competitors in our Xiox  Telemanagement  Systems product line. Based on industry
sources,  we believe that both Peregrine Telco and  ISI-Infortext  have revenues
that are at least twice as large as our revenues. Nortel Networks Corporation, a
public  company,  reported 1999  revenues of  approximately  $21 billion.  Cisco
Systems,  3Com Corporation,  Lucent Technologies and Nortel Networks Corporation
are our major  competitors  in our Town Square  Communications  Systems  product
line. All four are public companies with reported 1999 revenues of approximately
$12 billion,  $6 billion,  $38 billion,  and $21 billion  respectively.  In each
case, we believe our  competitors  have  marketing and  technological  resources
commensurate  with their revenues.  We cannot be certain that we will be able to
compete  successfully  against either  current or potential  competitors or that
competition   will  not  have  a  material   adverse  effect  on  our  business,
consolidated results of operations and financial condition.

If we lose the business of our largest  customer,  our revenues may decrease and
our business may suffer.

         One of our customers  accounted for 12% of our revenue during 1999. The
loss or serious  reduction in business from this customer  could have a material
adverse effect on our business, consolidated results of operations and financial
condition in future periods.

If we lose our ability to sell our products through our network of dealers,  our
revenues may decrease and our business may suffer.

         We sell our  products  primarily  through  our  network  of  authorized
dealers. Like other companies that sell products through a network of authorized
dealers, our ability to effectively distribute our products depends in part upon
the  financial  and business  condition of our  distribution  network,  which is
outside of our control. The loss of or a significant  reduction in business with
any one of our  major  dealers  could  have a  material  adverse  effect  on our
business,  consolidated  results of operations and financial condition in future
periods.


                                       5
<PAGE>


We may not be able to expand our sales and  distribution  channels,  which would
harm our ability to generate revenue

         We believe  that our future  success is  dependent  upon our ability to
continue to expand our sales force and establish successful relationships with a
variety  of  international  and  domestic  carriers,  local  competitive  access
carriers,  data and voice communication VARs, and selected PC manufacturers.  If
we are not able to increase  our direct  sales  staff and  channel  distribution
partners,  we will not be able expand our business. We cannot be certain that we
will be able to reach agreement with additional channel distribution partners on
a timely  basis or at all,  or that these  channel  distribution  partners  will
devote adequate resources to marketing, selling and supporting our products. Our
inability to generate  revenue from our sales  offices and channel  distribution
partners may harm our business, financial condition and results of operations.

If we do not increase our sales,  our revenues may decrease and our business may
suffer.

         Our  future  success,  like the  success  of  other  telecommunications
management  companies,  will  depend on  deriving a  substantial  portion of our
revenues  from sales of call  accounting  products to new  customers  as well as
updates and rate table renewals to existing  customers.  As a result, any factor
adversely   affecting  these  sales,   including  market   acceptance,   product
performance  and  reliability,   reputation,  price  competition  and  competing
products,  as well as  general  economic  and  market  conditions,  could have a
material adverse effect on our business,  consolidated results of operations and
financial condition.

Our future ability to generate sales may depend on the  interoperability  of our
equipment with those of other vendors.

         Our open,  standards-based  Town Square system is designed to interface
with support  applications and devices from third party vendor in order to allow
our customers to take advantage of newer technology and support additional users
without the need to replace the entire system.  If third party  applications and
devices are not  interoperable  with our Town Square  system,  our customers may
seek  other   communications   network   solutions  that  can  provide   product
interoperability.  This could seriously harm our business,  financial  condition
and prospects.

If our software  products  contain errors or defects,  our revenues may decrease
and our business may suffer.

         The  software  products  we offer,  like many  software  products,  are
internally  complex and,  despite  extensive  testing and quality  control,  may
contain errors or defects ("bugs"), especially when first introduced. Defects or
errors could result in corrective  releases to our software products,  damage to
our reputation,  loss of revenues,  an increase in product  returns,  claims for
damages, or lack of market acceptance of our products, any of which could have a
material and adverse effect on our business,  consolidated results of operations
and financial condition.

If we encounter delays or difficulties in developing our products,  our revenues
may decrease and our business may suffer.

         Delays or  difficulties  in the  execution of product  development  may
occur within any telecommunications management company, including At Comm. These
delays or difficulties  may result in the  cancellation  of planned  development
projects  and  could  have a  material  and  adverse  effect  on  our  business,
consolidated results of operations and financial condition.


                                       6
<PAGE>


If we do not receive  additional  funding for our new product line, our business
may be adversely affected.

         In 1997,  we began a  significant  development  effort in a new product
line  addressing the combined  telephony and data markets.  Although we received
since 1997 approximately  $32.9 million in funding for this development  effort,
we will require additional funding before the new product line returns a profit.
The additional funding will be used for marketing, continued engineering, sales,
working capital, and to fund research and development  activities.  We cannot be
certain that we will be able to obtain the additional  required funding, or that
the new product line will become profitable.  Moreover,  the introduction of the
new product line may result in a new group of competitors.


                                       7
<PAGE>

                       WHERE YOU CAN FIND MORE INFORMATION

         This  prospectus  does  not  include  all the  information  that may be
important to you.  You should read the entire  prospectus  carefully  before you
decide to invest.

         In addition,  you should be aware that this prospectus constitutes part
of a registration statement on Form S-3, together with all of its amendments and
exhibits.  This  prospectus does not contain all of the information set forth in
the  registration  statement,  certain  parts of which are omitted in accordance
with the rules and regulations of the SEC. For further information, please refer
to the registration  statement,  copies of which may be obtained from the Public
Reference Room of the SEC, 450 Fifth Street,  NW,  Washington,  D.C. 20549, upon
payment of the fees prescribed by the SEC.

         Statements  contained  in this  prospectus  about the  contents  of any
document filed as an exhibit to the registration  statement,  or incorporated by
reference  in the  registration  statement,  must be read in the  context of the
registration statement and as qualified in all respects by that context.

         We file annual,  quarterly and special  reports,  proxy  statements and
other  information  with the SEC.  You may read and copy any document we file at
the SEC's public  reference  rooms in  Washington,  D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public  reference rooms. Our SEC filings are also available to the public
from the SEC's web site at http://www.sec.gov.

         Our common stock is quoted on the NASDAQ SmallCap  Market.  Reports and
other information  concerning us may be inspected at the National Association of
Securities Dealers, Inc., 1735 K Street, N.W., Washington, D.C. 20006.

         The SEC allows us to "incorporate by reference" the information we file
with them,  which means that we can  disclose  important  information  to you by
referring you to documents we file with the SEC. The information incorporated by
reference is considered to be part of this prospectus.  Information that we file
later with the SEC will automatically update and supersede this information.  We
incorporate  by reference the documents  listed below and any future  filings we
will  make  with  the SEC  under  Sections  13(a),  13(c),  14 or  15(d)  of the
Securities  Exchange Act of 1934 until the selling  shareholders sell all of the
shares covered by this prospectus:

         (1)     our Forms 8-K filed on January 10, 2000 and March 7, 2000;

         (2)     our Annual  Report on Form  10-KSB  for the  fiscal  year ended
                 December 31, 1999;

         (3)     our  Quarterly  Reports on Forms  10-QSB and  10-QSB/A  for the
                 quarters ended March 31,  1999,June 30, 1999, and September 30,
                 1999; and

         (4)     our Proxy Statement on Form 14A as filed on April 14, 2000.

This  prospectus is part of a registration  statement we filed with the SEC. You
may request a copy of the registration statement or any of the above filings, at
no cost, by writing or telephoning the Chief Financial  Officer at the following
address:

         At Comm Corporation
         577 Airport Boulevard, Suite 700
         Burlingame, California 94010
         (650) 375-8188


                                       8
<PAGE>


                              SELLING SHAREHOLDERS
<TABLE>
         The following table provides the names of the selling  shareholders and
the number of shares being  offered by each of them.  After  completion  of this
offering,   assuming  all  the  shares  offered  hereby  are  sold,  no  selling
shareholder  will  hold  any At  Comm  securities  except  as set  forth  in the
footnotes below.
<CAPTION>
                           Selling Shareholders                        No. of Shares Offered
                           ------------------------------------------------------------------
<S>                                                                           <C>
Capital Research and Management Company, on behalf of                         230,000
SMALLCAP World Fund, Inc. Clipperbay & Co.

Private Equity Finance, Ltd.                                                  100,000

Edmund Shea and Mary Shea real property trust TR UA 10/3/85                   100,000

Flanders Language Valley Fund CVA                                              75,000

Ziff Asset Management, LP                                                      75,000

Rennes Foundation
Dietrich, Baumgartner & Partners                                               62,500

Lagunitas Partners, LP                                                         57,500

Bay Area Microcap Fund, LP                                                     50,000(1)

Rodney Smith                                                                   50,000

Clarion Capital Corp.                                                          25,000

Palantir Partners, LP                                                          25,000

Palantir Investments, LDC                                                      25,000

Compass Chicago Partners, LP                                                   22,500

Compass Technology Partners, LP                                                22,500

Capital Research and Management Company on behalf of
Variable Insurance Global Small Capitalization World Fund Piping & Co.         20,000

Roy and Ruth Rogers Unit Trust UTD 9/28/89                                     10,000
Maletis Partners, LP                                                           10,000

Gruber and McBaine International                                               10,000

The Rogers Family Trust UTD 1/21/81                                            10,000

Clarion Partners, LP                                                            9,900

Fred B. Bialek                                                                  7,500

Jon and Linda Gruber                                                            7,500

Compass Venture Partners, LP                                                    5,000

Clarion Offshore Fund, Ltd.                                                     3,850

The Maletis Trust UTD 12/13/90                                                  3,000

The M&T Profit Sharing Trust dated 12/23/76                                     3,000

Compass Management Partners, LP                                                   250
<FN>
- --------------
         1 Bay Area  Microcap  Fund  owns  321,664  shares  of  common  stock in
addition to the shares offered hereby.
</FN>
</TABLE>

                                       9
<PAGE>


         No selling shareholder has held any position,  office or other material
relationship  with us or any of our  affiliates  within  the past  three  years,
except Philip Vermeulen, who is one of our directors and is the CEO and managing
director of Flanders  Language  Valley  Management,  NV ("FLV").  Mr.  Vermeulen
disclaims beneficial ownership of the shares held by FLV except to the extent of
his proportionate ownership interest in FLV.

         We sold 375,000 shares of Series B Preferred Stock on December 30,1999,
and 645,000 shares of Series B Preferred Stock on February 7, 2000 to certain of
the  selling  shareholders  in  private  transactions.  The  shares  of Series B
Preferred  Stock are convertible  into an equivalent  number of shares of common
stock.  Such shares of common stock,  issuable  upon  conversion of the Series B
Preferred Stock are registered hereunder.

         Each  selling  shareholder  has  represented  to us that he, she, or it
purchased  the  securities  described  above  for  investment,  with no  present
intention of distribution.  However,  in recognition of the fact that investors,
even though purchasing the securities  described above for investment,  may wish
to be legally permitted to sell their securities when they deem appropriate,  we
have  filed  with the  Commission  under  the  Securities  Act the  registration
statement  with respect to the sale of the common stock covered hereby from time
to time in through public or private transactions, on or off the NASDAQ SmallCap
Market, at prevailing market prices or privately negotiated prices,  through the
writing of options  on the  securities  owned by the  selling  shareholders,  or
through a  combination  of the  foregoing.  We have  agreed to use  commercially
reasonable  efforts to prepare and file such  amendments and  supplements to the
registration  statement as may be necessary to keep the  registration  statement
effective until February 7, 2002.

                              PLAN OF DISTRIBUTION

         Any or all of the shares may be sold from time to time by each  selling
shareholder,    its    pledges,    donors,    transferees,    distributees    or
successors-in-interest.  Each selling  shareholder  may sell all or a portion of
the shares  from time to time  while the  registration  statement  of which this
prospectus  is a part  remains  effective.  At Comm has agreed  that it will use
commercially  reasonable  efforts to keep the registration  statement  effective
until  February 7, 2002 (or a shorter period if all the shares have been sold or
disposed of prior to such time). The aggregate proceeds to a selling shareholder
from the sale of shares  offered  by it hereby  will be the prices at which such
shares are sold, less any commissions.

         Each selling shareholder may sell shares on the NASDAQ SmallCap Market,
in privately negotiated  transactions or otherwise,  at fixed prices that may be
changed,  at market prices prevailing at time of sale, at prices related to such
market prices or at negotiated prices.

         Shares  may be sold by one or more of the  following  methods,  without
limitation:

         o     block  trades in which the  broker  or  dealer  so  engaged  will
               attempt to sell the shares as agent but may position and resell a
               portion of the block as principal to facilitate the transaction,
         o     purchases by a broker or dealer as  principal  and resale by such
               broker or dealer for its account pursuant to this prospectus,
         o     ordinary  brokerage  transactions  and  transactions in which the
               broker solicits purchasers,
         o     privately negotiated transactions, and
         o     a combination of any such methods of sale.

         In  effecting  sales,  brokers  and  dealers  engaged  by  the  selling
shareholder may arrange for other brokers or dealers to participate.  Brokers or
dealers may receive  commissions or discounts from the selling  shareholder (or,
if any such broker-dealer  acts as agent for the purchaser of such shares,  from
such  purchaser)  in amounts to be  negotiated  which are not expected to exceed
those customary in the types of transactions involved.  Broker-


                                       10
<PAGE>


dealers may agree with the  selling  shareholder  to sell a specified  number of
shares at a stipulated price per share, and, to the extent such broker-dealer is
unable to do so acting as agent for the  selling  shareholder,  to  purchase  as
principal any unsold shares at the price  required to fulfill the  broker-dealer
commitment  to the selling  shareholder.  Broker-dealers  who acquire  shares as
principal may  thereafter  resell such shares from time to time in  transactions
(which  may  involve  block   transactions   and  sales  to  and  through  other
broker-dealers,  including  transactions of the nature  described  above) in the
over-the-counter  market or otherwise at prices and on terms then  prevailing at
the time of sale, at prices then related to the then-current  market price or in
negotiated  transactions  and, in connection  with such  resales,  may pay to or
receive from the purchasers of such shares  commissions as described above. Each
selling  shareholder  may also sell shares in accordance with Rule 144 under the
Securities Act, rather than pursuant to this prospectus.

         In connection  with  distributions  of shares or  otherwise,  a selling
shareholder may enter into hedging  transactions  with  broker-dealers  or other
financial institutions. In connection with such transactions,  broker-dealers or
other financial institutions may engage in short sales of At Comm's common stock
in the course of hedging the positions they assume with the selling shareholder.
The selling  shareholder  may also sell At Comm's common stock short and deliver
shares to close out such short positions. The selling shareholder may also enter
into  option  or other  transactions  with  broker-dealers  or  other  financial
institutions  which  require  the  delivery  to  such  broker-dealers  or  other
financial   institutions   of  shares   offered   hereby,   which   shares  such
broker-dealers  or other  financial  institutions  may resell  pursuant  to this
prospectus. The selling shareholder may also pledge shares to a broker-dealer or
other financial  institution,  and, upon default,  such  broker-dealer  or other
financial  institution  may effect sales of the pledged shares  pursuant to this
prospectus.

         The selling  shareholder and any brokers and dealers through whom sales
of the shares are made may be deemed to be "underwriters"  within the meaning of
the Securities Act, and the commissions or discounts and other compensation paid
to such persons may be regarded as underwriters' compensation.  At Comm will pay
all  expenses of  registration  (including  the fees and expenses of the selling
shareholder's  counsel)  incurred  in  connection  with this  offering,  but the
selling shareholder will pay all underwriting  discounts,  brokerage commissions
and other  similar  expenses  incurred by the selling  shareholder.  At Comm has
agreed to indemnify the selling  shareholder  against  certain  losses,  claims,
damages and liabilities, including those arising under the Securities Act.

         The selling  shareholder may sell the shares at any price. Sales of the
shares at less than  market  prices may  depress  the market  price of At Comm's
common stock. Moreover, generally, selling shareholders are not restricted as to
the number of shares which may be sold at any one time,  and it is possible that
a significant number of shares could be sold at the same time.

                                  LEGAL MATTERS

         For the purposes of this offering,  Wilson  Sonsini  Goodrich & Rosati,
Professional  Corporation,  Palo Alto, California,  is giving its opinion on the
validity of the shares and certain legal matters pertaining to At Comm.


                                       11
<PAGE>


                     COMMISSION POSITION ON INDEMNIFICATION

         Section  145  of  the  Delaware  General   Corporation  Law  permits  a
corporation to include in its charter  documents,  and in agreements between the
corporation  and its directors and officers,  provisions  expanding the scope of
indemnification beyond that specifically provided by the current law.

         Article  VI of  our  Certificate  of  Incorporation  provides  for  the
indemnification  of directors to the fullest extent  permissible  under Delaware
law.

         Article VI of our Bylaws provides for the  indemnification of officers,
directors and third parties  acting on behalf of the  corporation if such person
acted in good faith and in a manner reasonably believed to be in and not opposed
to the best  interest of the  corporation,  and,  with  respect to any  criminal
action or proceeding,  the indemnified party had no reason to believe his or her
conduct was unlawful.

         We have entered into indemnification  agreements with our directors and
executive officers,  in addition to indemnification  provided for in our Bylaws,
and we intend to enter into  indemnification  agreements  with any new directors
and executive officers in the future.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors,  officers and persons  controlling At
Comm pursuant to the foregoing provisions,  or otherwise,  we have been informed
that  in  the  opinion  of  the   Securities   and  Exchange   Commission   such
indemnification  is against public policy as expressed in the Securities Act and
is therefore unenforceable.

                                     EXPERTS

         The  consolidated  financial  statements  of At  Comm,  (formerly  Xiox
Corporation), as of December 31, 1999 and 1998, and for each of the years in the
two year period ended  December 31, 1999,  have been  incorporated  by reference
herein and in the  registration  statement  in reliance  upon the report of KPMG
LLP, independent certified public accountants, incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.


                                       12
<PAGE>

================================================================================

         No  dealer,   salesperson  or  other  person  has  been  authorized  in
connection  with any offering made hereby to give any information or to make any
representations  other than those  contained in or  incorporated by reference in
this Prospectus, and, if given or made, such information or representations must
not be  relied  upon  as  having  been  authorized.  This  Prospectus  does  not
constitute  an offer to sell or a  solicitation  of an offer to buy any security
other than the  securities  offered  hereby,  nor does it constitute an offer to
sell or a solicitation of any offer to buy any of the securities  offered hereby
to any person in any  jurisdiction in which such offer or solicitation  would be
unlawful or to any person to whom it is  unlawful.  Neither the delivery of this
Prospectus nor any offer or sale made hereunder shall,  under any circumstances,
create any  implication  that there has been no change in the affairs of At Comm
or that the information contained herein is correct as of any time subsequent to
the date hereof.



                    TABLE OF CONTENTS

                                                                            Page

Forward Looking Statements.....................................................3
Risk Factors...................................................................4
Where You Can Find More Information............................................8
Selling Shareholders ..........................................................9
Plan of Distribution......................................................... 10
Legal Matters.................................................................11
Experts.......................................................................12




                              At Comm Corporation



                        1,020,000 Shares of Common Stock



                                   PROSPECTUS




                                   May 8, 2000


                                      II-1
================================================================================


<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution

         The following table sets forth the various  expenses in connection with
the sale  and  distribution  of the  securities  being  registered,  other  than
underwriting  discounts and commissions.  All of the amounts shown are estimates
except the Securities and Exchange  Commission  registration  fee and the NASDAQ
SmallCap Market listing fee.

    Securities and Exchange Commission registration fee            $ 7,607
    Nasdaq SmallCap Market listing fee                               7,500
    Printing and engraving expenses                                  1,000
    Legal fees and expenses                                         25,000
    Accounting fees and expenses                                    10,000
    Transfer agent and registrar fees and expenses                   5,000
    Miscellaneous                                                    1,500
                                                                   -------
             Total                                                 $57,607
                                                                   =======


Item 15.  Indemnification of Directors and Officers

         Section  145  of  the  Delaware  General   Corporation  Law  permits  a
corporation to include in its charter  documents,  and in agreements between the
corporation  and its directors and officers,  provisions  expanding the scope of
indemnification beyond that specifically provided by the current law.

         Article  VI of  our  Certificate  of  Incorporation  provides  for  the
indemnification  of directors to the fullest extent  permissible  under Delaware
law.

         Article VI of our Bylaws provides for the  indemnification of officers,
directors and third parties  acting on behalf of the  corporation if such person
acted in good faith and in a manner reasonably believed to be in and not opposed
to the best  interest of the  corporation,  and,  with  respect to any  criminal
action or proceeding,  the indemnified party had no reason to believe his or her
conduct was unlawful.

         We have entered into indemnification  agreements with our directors and
executive officers,  in addition to indemnification  provided for in our Bylaws,
and intend to enter into  indemnification  agreements with any new directors and
executive officers in the future.


                                      II-2
<PAGE>

Item 16.  Exhibits

<TABLE>
<CAPTION>
  Exhibit                                            Description
  Number
<S>       <C>
3.1(1)    Certificate of Incorporation as filed with the Secretary of State of the State of
          Delaware.

3.2(1)    Bylaws.

3.3(2)    Certificate of Amendment of Incorporation dated May 26, 1998

3.4(2)    Certificate of Designations, Preferences and Other Rights of the Series A Preferred

3.5(3)    Certificate of Amendment of Incorporation dated May 26, 1999

3.6(4)    Certificate of Designations, Preferences and Other Rights of the Series B Preferred

3.7       Certificate of Ownership and Merger Merging At Comm Corporation With and Into Xiox
          Corporation

4.4(5)    Form of Common Stock Certificate

4.8(6)    Stock Purchase and Investor Rights Agreement, as amended, dated February 7, 2000 between
          the Registrant and certain investors and the exhibits thereto

5.1       Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation

23.1      Consent of KPMG LLP, independent auditors

23.2      Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (Included in
          Exhibit 5.1 hereto)

24.1      Power of Attorney (included on P. II-5)

- --------------------------------------------------------------------------------
(1)      Incorporated by reference to the  Registrant's  Report on Form 10-K for
         the year ended December 31, 1987.

(2)      Incorporated by reference to the Registrant's  Report on Form 8-K filed
         September 24, 1998.

(3)      Incorporated by reference to the  Registrant's  Report on Form 10-QSB-A
         filed November 30, 1999.

(4)      Incorporated by reference to the Registrant's  Report on Form 8-K filed
         January 10, 2000.

(5)      Incorporated by reference to the Registrant's Registration Statement on
         Form S-3/A filed February 24, 1999.

(6)      Incorporated by reference to the Registrant's Report on Form 8-KA filed
         March 7, 2000.

</TABLE>

                                      II-3
<PAGE>


Item 17.  Undertaking

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors,  officers and persons  controlling At
Comm pursuant to the foregoing provisions,  or otherwise,  we have been informed
that  in  the  opinion  of  the   Securities   and  Exchange   Commission   such
indemnification  is against public policy as expressed in the Securities Act and
is therefore unenforceable.

         In the event that a claim for indemnification  against such liabilities
(other than the  payment by At Comm of expenses  incurred or paid by a director,
officer  or  controlling  persons  of At Comm in the  successful  defense of any
action, suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered,  At Comm will, unless
in the  opinion  of its  counsel  the matter  has been  settled  by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification  by it is  against  public  policy  as  expressed  in  the
Securities Act and will be governed by the final adjudication of such issue.


         The undersigned Registrant hereby undertakes:

         1. To file,  during any period in which offers or sales are being made,
a  post-effective  amendment  to this  registration  statement  to  include  any
prospectus  required by section 10(a)(3) of the Securities Act of 1933,  reflect
any facts or events which  represent a fundamental  change in the information in
the registration  statement,  or any additional or changed material  information
with  respect  to the  plan of  distribution  not  previously  disclosed  in the
registration statement.

         2.  That,  for the  purpose  of  determining  any  liability  under the
Securities  Act of  1933,  each  such  amendment  shall  be  deemed  to be a new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

         3. To remove from  registration by means of a post-effective  amendment
any of the securities  being registered that remain unsold at the termination of
the offering.


                                     II-4
<PAGE>


                                   SIGNATURES

         Pursuant to the  requirements  of the  Securities  Act of 1933, At Comm
Corporation  certifies that it has  reasonable  grounds to believe that it meets
all  requirements  for filing on Form S-3 and has duly caused this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of Burlingame,  State of California, on this 8th day of
May, 2000.

                                           At Comm Corporation

                                           By: / / William H. Welling
                                              ----------------------------------
                                           William H. Welling
                                           President and Chief Executive Officer


                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE  PRESENTS,  that each person whose  signature
appears  below  hereby  constitutes  and  appoints  William H.  Welling,  as his
attorney-in-fact,  with  full  power  of  substitution,  for  him in any and all
capacities, to sign any and all amendments to this Registration Statement and to
file  the  same,  with  exhibits  thereto  and  other  documents  in  connection
therewith,  with the Securities and Exchange  Commission,  hereby  ratifying and
confirming  our signatures as they may be signed by our said attorney to any and
all amendments to said Registration Statement.
<TABLE>
         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.
<CAPTION>
                   Signature                         Title                               Date

<S>                                      <C>                                          <C>
/ / William H. Welling                   President and Chief Executive Officer and    May 8, 2000
- ---------------------------------        Director (Principal Executive Officer)
          (William H. Welling)


/ / Melanie D. Johnson                   Chief Financial Officer                      May 8, 2000
- ---------------------------------
          (Melanie D. Johnson)


/ / Mark A. Parrish, Jr.                 Director                                     May 8, 2000
- ---------------------------------
          (Mark A. Parrish, Jr.)


/ / Robert K. McAfee                     Director                                     May 8, 2000
- ---------------------------------
          (Robert K. McAfee)


/ / Bernard T. Marren                    Director                                     May 8, 2000
- ---------------------------------
          (Bernard T. Marren)


/ / Atam Lalchandani                     Director                                     May 8, 2000
- ---------------------------------
          (Atam Lalchandani)


/ / Philip Vermeulen                     Director                                     May 8, 2000
- ---------------------------------
         (Philip Vermeulen)
</TABLE>


                                      II-5
<PAGE>
                                 Exhibit Index

<TABLE>
<CAPTION>
  Exhibit                                            Description
  Number
<S>       <C>


3.1(1)    Certificate of Incorporation as filed with the Secretary of State of the State of
          Delaware.

3.2(1)    Bylaws.

3.3(2)    Certificate of Amendment of Incorporation dated May 26, 1998

3.4(2)    Certificate of Designations, Preferences and Other Rights of the Series A Preferred

3.5(3)    Certificate of Amendment of Incorporation dated May 26, 1999

3.6(4)    Certificate of Designations, Preferences and Other Rights of the Series B Preferred

3.7       Certificate of Ownership and Merger Merging At Comm Corporation With and Into Xiox
          Corporation

4.4(5)    Form of Common Stock Certificate

4.8(6)    Stock Purchase and Investor Rights Agreement, as amended, dated February 7, 2000 between
          the Registrant and certain investors and the exhibits thereto

5.1       Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation

23.1      Consent of KPMG LLP, independent auditors

23.2      Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (Included in
          Exhibit 5.1 hereto)

24.1      Power of Attorney (included on P. II-5)

- --------------------------------------------------------------------------------
(1)      Incorporated by reference to the  Registrant's  Report on Form 10-K for
         the year ended December 31, 1987.

(2)      Incorporated by reference to the Registrant's  Report on Form 8-K filed
         September 24, 1998.

(3)      Incorporated by reference to the  Registrant's  Report on Form 10-QSB-A
         filed November 30, 1999.

(4)      Incorporated by reference to the Registrant's  Report on Form 8-K filed
         January 10, 2000.

(5)      Incorporated by reference to the Registrant's Registration Statement on
         Form S-3/A filed February 24, 1999.

(6)      Incorporated by reference to the Registrant's Report on Form 8-KA filed
         March 7, 2000.


                                      II-6

</TABLE>


                                   Exhibit 3.7

                       CERTIFICATE OF OWNERSHIP AND MERGER

                                     MERGING

                               AT COMM CORPORATION

                                  WITH AND INTO

                                XIOX CORPORATION

      (Pursuant to Section 253 of the General Corporation Law of Delaware)

         XIOX  CORPORATION,  a Delaware  corporation (the  "Corporation"),  does
hereby certify:

         FIRST:  That the  Corporation is  incorporated  pursuant to the General
Corporation Law of the State of Delaware.

         SECOND:  That the Corporation owns all of the outstanding shares of the
capital stock of AT COMM CORPORATION, a Delaware corporation ("Merger Sub").

         THIRD: That the Corporation,  by the following resolutions of its Board
of  Directors,  duly adopted on the 31 day of March,  2000,  determined to merge
Merger Sub with and into the  Corporation  on the  conditions  set forth in such
resolutions:

         RESOLVED,  that  the  Corporation  merge  Merger  Sub with and into the
Corporation and assume all of said  subsidiary's  liabilities  and  obligations,
effective as of the close of business on March 31, 2000; and be it further

         RESOLVED,  that upon the effective date of the merger,  the name of the
Corporation shall be changed to "At Comm Corporation"; and be it further

         RESOLVED,  that the  President  or  Chief  Financial  Officer,  and the
Secretary or any Assistant Secretary, of the Corporation be, and they hereby are
directed to make,  execute and acknowledge a Certificate of Ownership and Merger
setting forth a copy of the  resolutions  to merge said Merger Sub with and into
the Corporation,  to change the Corporation's name to At Comm Corporation and to
assume  Merger Sub's  liabilities  and  obligations  and to file the same in the
Office of the Secretary of State of Delaware and a certified copy thereof in the
Office of the Recorder of Deeds of New Castle County; and be it further

         RESOLVED, that the officers of the Corporation be, and they hereby are,
severally  and not  jointly,  authorized  and  directed to provide all  notices,
execute all documents,  make all filings and take all actions as any of them may
deem to be necessary or appropriate  in connection  with the carrying out of the
purposes of the foregoing resolutions.

                                      II-7

<PAGE>

         IN WITNESS  WHEREOF,  the Corporation has caused this Certificate to be
executed by its authorized officers this 31 day of March, 2000.

                                       XIOX CORPORATION

                                       By: /s/ William H. Welling
                                           -------------------------------------
                                           William H. Welling
                                           President and Chief Executive Officer


         ATTEST:

         By: /s/ Melanie D. Johnson
             ---------------------------
             Melanie D. Johnson
             Chief Financial Officer

                                      II-8





                                     EX-4.4
                        FORM OF COMMON STOCK CERTIFICATE

- --------------------------------------------------------------------------------

                            AT COMM CORPORATION LOGO

NUMBER                                                                    SHARES


THIS CERTIFICATE IS TRANSFERABLE IN    SEE THE REVERSE FOR A STATEMENT AS TO THE
NEW YORK, N.Y.                              RIGHTS, PREFERENCES, PRIVILEGES AND
AND RIDGEFIELD PARK, NJ                 RESTRICTIONS OF THE CORPORATION'S SHARES

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE



- --------------------------------------------------------------------------------
This is to certify that                                      CUSIP 00208K  10  5



is the owner of
- --------------------------------------------------------------------------------

FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, WITH
                              PAR VALUE OF $.01, OF

                               AT COMM CORPORATION

Transferable  on the share  register  of the  Corporation,  in person or by duly
authorized  Attorney,  upon surrender of this Certificate  properly  endorsed or
assigned.

This  Certificate  is not valid until  countersigned  by the transfer  agent and
Registered by the registrar.

WITNESS the facsimile  seal of Corporation  and the facsimile  signatures of its
duly authorized officers.

Dated:

/s/                                                  /s/
CHIEF FINANCIAL OFFICER AND SECRETARY        CHAIRMAN OF THE BOARD AND PRESIDENT

                            AT COMM CORPORATION SEAL
                                    GOES HERE

- --------------------------------------------------------------------------------

                                      II-9

<PAGE>

                               AT COMM CORPORATION

A full  statement  of the  rights,  preferences,  privileges,  and  restrictions
granted to or imposed upon the respective  classes of shares of the Corporation,
including  the  Common  Stock,   ownership  of  which  is  represented  by  this
certificate,  and the Preferred Stock, and upon the respective  holders thereof,
may be  obtained by any  shareholder  upon  request and without  charge from the
Secretary of the Corporation, at the principal office of the Corporation.

The Board of  Directors  has the  authority  to fix the  number of shares of any
series of Preferred  Stock,  to determine the  designation of such series and to
determine or alter the rights, preferences, privileges and restrictions upon any
wholly unissued series of Preferred Stock.


The following  abbreviations,  when used in the  inscription on the face of this
certificate,  shall  be  construed  as  though  they  were  written  out in full
according to applicable laws or regulations:

TEN COM -- as tenants in common              UNIF GIT MIN ACT--........Custodian
TEN ENT -- as tenants by the  entireties               (Cust)         (Minor)
JT TEN  -- as joint tenants with right             under Uniform Gifts to Minors
           of survivorship and not as                       Act.................
           tenants in common                                             (State)


Additional abbreviations may also be used though not in the above list.

For Value Received, _______________ hereby sell, assign and transfer  unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE

- ------------------------------------------------------------------

- ------------------------------------------------------------------

- --------------------------------------------------------------------------------
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

 -------------------------------------------------------------------------------

 -------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Shares of the Common Stock represented by the within certificate, and do hereby
irrevocably constitute and appoint


- --------------------------------------------------------------------------------

Attorney  to  transfer  the  said  shares  on  the  books  of the  within  named
Corporation with full power of substitution in the premises.

Dated
      --------------------------------------------------
                              --------------------------------------------------
                              NOTICE:  THE  SIGNATURE  TO THIS  ASSIGNMENT  MUST
                              CORRESPOND  WITH THE NAME AS WRITTEN UPON THE FACE
                              OF THE  CERTIFICATE IN EVERY  PARTICULAR,  WITHOUT
                              ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.


                                      II-10



                                     EX-5.1
                   Opinion of Wilson Sonsini Goodrich & Rosati

                                                                     Exhibit 5.1


                                   May 8, 2000



At Comm Corporation
557 Airport Boulevard, Suite 700
Burlingame, CA 94010

         Re:      At Comm Corporation (the "Company") Registration  Statement on
                  Amendment 3 to Form S-3

Ladies and Gentlemen:

         We have  examined  the  Registration  Statement on Form S-3 to be filed
with the Securities and Exchange Commission (the "Registration  Statement"),  in
connection with the  registration  under the Securities Act of 1933, as amended,
of a shelf offering of (i) 1,020,000 shares of the Company's common stock,  $.01
par value per share  (the  "Shares").  As your  counsel,  we have  examined  the
proceedings proposed to be taken in connection with the sale and issuance of the
above-referenced securities.

         It is our opinion that the Shares are legally and validly issued, fully
paid and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement,  and further consent to the use of our name wherever appearing in the
Registration  Statement,  including the Prospectus  constituting a part thereof,
and any amendment thereto.

                                           Very truly yours,

                                           WILSON, SONSINI, GOODRICH & ROSATI
                                           Professional Corporation

                                           / / Wilson Sonsini Goodrich & Rosati


                                      II-11


                                     EX-23.1

                         Consent of Independent Auditors

                                                                    Exhibit 23.1

The Board of Directors
At Comm Corporation:

We consent to incorporation by reference in the Registration  Statement filed on
or about May 8, 2000,  on Form S-3 of At Comm  Corporation  of our report  dated
February11,  2000,  relating  to the  consolidated  balance  sheets  of At  Comm
Corporation and subsidiaries,  (formerly Xiox Corporation and subsidiaries),  as
of  December  31,  1999 and 1998,  and the related  consolidated  statements  of
operations,  stockholders'  equity,  and cash flows for each of the years in the
two-year  period  ended  December  31, 1999,  which  report is  incorporated  by
reference  in the December  31,  1999,  Annual  Report on Form 10-KSB of At Comm
Corporation,  (Xiox  Corporation),  and to the  reference  of our firm under the
heading "Experts" in the Prospectus.

                                                              / /   KPMG LLP
                                                              --------------
                                                                    KPMG LLP


Mountain View, California
May 8, 2000


                                     II-12



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