<PAGE>
CUSIP No. 00758B109 13-G Page 7 of 8 Pages
EXHIBIT 1 TO SCHEDULE 13G
---------------------------------------------------
NOVEMBER 10, 2000
---------------------------------------------------
MORGAN STANLEY DEAN WITTER & CO. and MORGAN STANLEY & CO.
INCORPORATED hereby agree that, unless differentiated, this
Schedule 13G is filed on behalf of each of the parties.
MORGAN STANLEY DEAN WITTER & CO.
BY: /s/ Dennine Bullard
--------------------------------------------------------------------
Dennine Bullard / Morgan Stanley & Co. Incorporated
MORGAN STANLEY & CO. INCORPORATED
BY: /s/ Dennine Bullard
--------------------------------------------------------------------
Dennine Bullard / Morgan Stanley & Co. Incorporated
* Attention. Intentional misstatements or omissions of fact constitute federal
criminal violations (see 18 U.S.C. 1001).
