<PAGE>
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
(Rule 13d-102)
INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13d-1(b) (c), AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO RULE 13d-2(b)
Visual Networks, Inc.
- --------------------------------------------------------------------------------
(Name of Issuer)
Common Stock
- --------------------------------------------------------------------------------
(Title of Class of Securities)
928444108
---------------
(CUSIP Number)
September 1, 1998
- --------------------------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:
[_] Rule 13d-1(b)
[_] Rule 13d-(c)
[X] Rule 13d-1(d)
*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
<PAGE>
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CUSIP NO. 928444108 13G PAGE 2 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Venrock Associates
I.R.S. #13-6300995
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
New York, U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 0
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,003,618
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 0
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,003,618
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,003,618
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
4.47%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
PN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 2 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 3 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Venrock Associates II, L.P.
I.R.S. #13-3844754
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
New York, U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 0
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
617,221
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 0
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
617,221
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
617,221
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
2.75%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
PN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 3 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 4 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Anthony B. Evnin
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 46,804
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,620,839
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 46,804
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,620,839
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,667,643
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
7.43%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 4 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 5 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
David R. Hathaway
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 43,769
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,620,839
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 43,769
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,620,839
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,664,608
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
7.41%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 5 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 6 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Patrick F. Latterell
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 41,761
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,620,839
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 41,761
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,620,839
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,662,600
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
7.41%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 6 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 7 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Ted H. McCourtney
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 56,126
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,620,839
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 56,126
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,620,839
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,676,965
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
7.47%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 7 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 8 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Ray A. Rothrock
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 28,760
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,620,839
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 28,760
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,620,839
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,649,599
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
7.35%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 8 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 9 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Kimberley A. Rummelsburg
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 0
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,627,517
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 0
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,627,517
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,627,517
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
7.24%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 9 of 16 pages
<PAGE>
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CUSIP NO. 928444108 13G PAGE 10 OF 16 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Anthony Sun
###-##-####
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [X]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A.
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 52,200
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,620,839
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 52,200
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,620,839
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,673,039
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
7.45%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
Page 10 of 16 pages
<PAGE>
Introductory Note: This Statement on Schedule 13G is filed on behalf
of Venrock Associates, a limited partnership organized under the laws of the
State of New York, Venrock Associates II, L.P., a limited partnership organized
under the laws of the State of New York, Anthony B. Evnin, David R. Hathaway,
Patrick F. Latterell, Ted H. McCourtney, Ray A. Rothrock, Kimberley A.
Rummelsburg and Anthony Sun in respect of shares of Common Stock of Visual
Networks, Inc.
Item 1(a) Name of Issuer
- --------- --------------
Visual Networks, Inc.
Item 1(b) Address of Issuer's Principal Executive Offices
- --------- -----------------------------------------------
2092 Gaither Road
Rockville, MD 20850
Item 2(a) Name of Person Filing
- --------- ---------------------
Venrock Associates ("Venrock")
Venrock Associates II, L.P. ("Venrock II")
Anthony B. Evnin
David R. Hathaway
Patrick F. Latterell
Ted H. McCourtney
Ray A. Rothrock
Kimberley A. Rummelsburg
Anthony Sun
Item 2(b) Address of Principal Business Office or, if none, Residence
- --------- -----------------------------------------------------------
New York Office: Menlo Park Office:
30 Rockefeller Plaza 2494 Sand Hill Road
Room 5508 Suite 200
New York, NY 10112 Menlo Park, CA 94025
Item 2(c) Citizenship
- --------- -----------
Venrock and Venrock II are limited partnerships organized in the
State of New York. Anthony B. Evnin, David R. Hathaway, Patrick F.
Latterell, Ted H. McCourtney, Ray A. Rothrock, Kimberley A.
Rummelsburg and Anthony Sun are General Partners of Venrock and
Venrock II and all are citizens of the United States of America.
Item 2(d) Title of Class of Securities
- --------- ----------------------------
Common Stock
Item 2(e) CUSIP Number
- --------- ------------
928444108
Item 3 Not applicable.
- ------
Item 4 Ownership
- ------ ---------
(a) and (b)
Page 11 of 16 pages
<PAGE>
Venrock owns 1,003,618 shares or 4.47% of the outstanding shares of
common stock. Venrock II owns 617,221 shares or 2.75% of the
outstanding shares of common stock.
Anthony B. Evnin beneficially owns 1,667,643 shares or 7.34% of the
outstanding shares of common stock. David R. Hathaway beneficially
owns 1,664,608 shares or 7.41% of the outstanding shares of common
stock. Patrick F. Latterell beneficially owns 1,662,600 shares or
7.41% of the outstanding shares of common stock. Ted H. McCourtney
beneficially owns 1,676,965 shares or 7.47% of the outstanding shares
of common stock. Ray A. Rothrock beneficially owns 1,649,599 shares
or 7.35% of the outstanding shares of common stock. Kimberley A.
Rummelsburg beneficially owns 1,627,517 shares or 7.24% of the
outstanding shares of common stock. Anthony Sun beneficially owns
1,673,039 shares or 7.45% of the outstanding shares of common stock.
(c)
Anthony B. Evnin has sole voting and dispositive power over 46,804
shares of common stock and shared voting and dispositive power over
1,620,839 shares of common stock. David R. Hathaway has sole voting
and dispositive power over 43,769 shares of common stock and shared
voting and dispositive power over 1,620,839 shares of common stock.
Patrick F. Latterall has sole voting and dispositive power over 41,761
shares of common stock and shared voting and dispositive power over
1,620,839 shares of common stock. Ted H. McCourtney has sole voting
and dispositive power over 56,126 shares of common stock and shared
voting and dispositive power over 1,620,839 shares of common stock.
Ray A. Rothrock has sole voting and dispositive power over 28,760
shares of common stock and shared voting and dispositive power over
1,620,839 shares of common stock. Kimberly A. Rummelsburg has sole
voting and dispositive power over no shares of common stock and shared
voting and dispositive power over 1,627,517 shares of common stock.
Anthony Sun has sole voting and dispositive power over 52,200 shares
of common stock and shared voting and dispositive powers over
1,620,839 shares of common stock.
Item 5 Ownership of Five Percent or Less of a Class
- ------ --------------------------------------------
If this statement is being filed to report the fact that as of the
date hereof the reporting person has ceased to be the beneficial owner
of more than five percent of the class of securities, check the
following [ ].
Item 6 Ownership of More than Five Percent of Behalf of Another Person
- ------ ---------------------------------------------------------------
No person, other than the General Partners of Venrock and Venrock II,
has the right to receive or the power to direct the receipt of
dividends from, or the proceeds from the sale of, the shares of common
stock owned by Venrock and Venrock II.
Item 7 Identification and Classification of the Subsidiary which Acquired the
- ------ ----------------------------------------------------------------------
Security Being Reported on by the Parent Holding Company
--------------------------------------------------------
Not applicable.
Item 8 Identification and Classification of Members of the Group
- ------ ---------------------------------------------------------
This schedule is being filed pursuant to Rule 13d-1(d). The
identities of the seven General Partners of Venrock and Venrock II are
stated in Item 2.
Item 9 Notice of Dissolution of Group
- ------ ------------------------------
Not applicable.
Item 10 Certification
- ------- -------------
Not applicable.
Page 12 of 16 pages
<PAGE>
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Statement is true, complete and
correct.
February 9, 1999 VENROCK ASSOCIATES
By: /s/ Ted H. McCourtney
--------------------------
Ted H. McCourtney
General Partner
February 9, 1999 VENROCK ASSOCIATES II, L.P.
By: /s/ Ted H. McCourtney
--------------------------
Ted H. McCourtney
General Partner
February 9, 1999 GENERAL PARTNERS
/s/ Anthony B. Evnin
-------------------------------
Anthony B. Evnin
/s/ David R. Hathaway
-------------------------------
David R. Hathaway
/s/ Patrick F. Latterell
-------------------------------
Patrick F. Latterell
/s/ Ted H. McCourtney
-------------------------------
Ted H. McCourtney
/s/ Ray A. Rothrock
-------------------------------
Ray A. Rothrock
/s/ Kimberley A. Rummelsburg
-------------------------------
Kimberley A. Rummelsburg
/s/ Anthony Sun
-------------------------------
Anthony Sun
Page 13 of 16 pages
<PAGE>
Exhibit Index
Page No.
24.1 Power of Attorney dated as of February 9, 1999 15
granted by the General Partners in favor of
Mr. Ted H. McCourtney
99.1 Agreement pursuant to 13d-1(k)(1) among Venrock 16
Associates, Venrock Associates II, L.P. and the
General Partners thereof
Page 14 of 16 pages
<PAGE>
Exhibit 24.1
POWER OF ATTORNEY
KNOWN ALL MEN BY THESE PRESENTS that each person whose signature appears below
constitutes and appoints Ted H. McCourtney his or her true and lawful attorney-
in-fact and agent, acting alone, with full power of substitution and
resubstitution, for him or her and in his or her name, place and stead, in any
and all capacities, to sign the Schedule 13G, and all amendments thereto, with
all exhibits thereto, and all documents in connection therewith, with respect to
the beneficial ownership by the undersigned of the equity securities of Visual
Networks, Inc., and to file the same, with the Securities and Exchange
Commission and any other person, granting unto the attorney-in-fact and agent
full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as he or she might or could do in person, and hereby
ratifies and confirms all that said attorney-in-fact and agent or his substitute
or substitutes, may lawfully do or cause to be done.
February 9, 1999
/s/ Anthony B. Evnin
--------------------------------
Anthony B. Evnin
General Partner
/s/ David R. Hathaway
--------------------------------
David R. Hathaway
General Partner
/s/ Ted H. McCourtney
--------------------------------
Ted H. McCourtney
General Partner
/s/ Ray A. Rothrock
--------------------------------
Ray A. Rothrock
General Partner
/s/ Kimberley A. Rummelsburg
---------------------------------
Kimberley A. Rummelsburg
General Partner
/s/ Patrick F. Latterell
---------------------------------
Patrick F. Latterell
General Partner
/s/ Anthony Sun
---------------------------------
Anthony Sun
General Partner
Page 15 of 16 pages
<PAGE>
Exhibit 99.1
------------
AGREEMENT
Pursuant to Rule 13d-1(k)(1) promulgated pursuant to the Securities
Exchange Act of 1934, as amended, the undersigned agree that the attached
Schedule 13G is being filed on behalf of each of the undersigned.
February 9, 1999 VENROCK ASSOCIATES
By: /s/ Ted H. McCourtney
--------------------------
Ted H. McCourtney
General Partner
February 9, 1999 VENROCK ASSOCIATES II, L.P.
By: /s/ Ted H. McCourtney
--------------------------
Ted H. McCourtney
General Partner
February 9, 1999 GENERAL PARTNERS
/s/ Anthony B. Evnin
-------------------------------
Anthony B. Evnin
/s/ David R. Hathaway
-------------------------------
David R. Hathaway
/s/ Patrick F. Latterell
-------------------------------
Patrick F. Latterell
/s/ Ted H. McCourtney
-------------------------------
Ted H. McCourtney
/s/ Ray A. Rothrock
-------------------------------
Ray A. Rothrock
/s/ Kimberley A. Rummelsburg
-------------------------------
Kimberley A. Rummelsburg
/s/ Anthony Sun
-------------------------------
Anthony Sun
Page 16 of 16 pages
