EX-6 2 w49431ex6.txt JOINT FILING AGREEMENT 1 EXHIBIT 6 JOINT FILING AGREEMENT We, the signatories of the statement to which this Joint Filing Agreement is attached, hereby agree that such statement is filed, and any amendments thereto filed by either or both of us will be filed, on behalf of each of us. Dated: May 17, 2001. TCG HOLDINGS, L.L.C. By: /s/ John Harris ----------------------- Name: John Harris Title: Managing Director TC GROUP, L.L.C. By: TCG Holdings, L.L.C., its Managing Member By: /s/ John Harris ----------------------- Name: John Harris Title: Managing Director TCG VENTURES, L.L.C. By: TC Group, L.L.C., its Sole Member By: TCG Holdings, L.L.C., its Managing Member By: /s/ John Harris ------------------------ Name: John Harris Title: Managing Director CARLYLE U.S. VENTURE PARTNERS, L.P. By: TCG Ventures, L.L.C., its General Partner By: TC Group, L.L.C., its Sole Member By: TCG Holdings, L.L.C., its Managing Member By: /s/ John Harris ----------------------- Name: John Harris Title: Managing Director 2 CARLYLE VENTURE COINVESTMENT, L.L.C. By: TCG Ventures, L.L.C., its Managing Member By: TC Group, L.L.C., its Sole Member By: TCG Holdings, L.L.C., its Managing Member By: /s/ John Harris ----------------------- Name: John Harris Title: Managing Director TCG VENTURES, LTD. By: TCG Ventures, L.L.C., its Sole Shareholder By: TC Group, L.L.C., its Sole Member By: TCG Holdings, L.L.C., its Managing Member By: /s/ John Harris ------------------------ Name: John Harris Title: Managing Director CARLYLE VENTURE PARTNERS, L.P. By: TCG Ventures, Ltd., its General Partner By: TCG Ventures, L.L.C., its Sole Shareholder By: TC Group, L.L.C., its Sole Member By: TCG Holdings, L.L.C., its Managing Member By: /s/ John Harris ----------------------- Name: John Harris Title: Managing Director C/S VENTURE INVESTORS, L.P. By: TCG Ventures, Ltd., its Managing General Partner By: TCG Ventures, L.L.C., its Sole Shareholder By: TC Group, L.L.C., its Sole Member By: TCG Holdings, L.L.C., its Managing Member By: /s/ John Harris ----------------------- Name: John Harris Title: Managing Director