2.2 Custom Third-Party Objects (C3POs)

GroupWise C3PO lets you add menu and toolbar items to trigger applications and capture commands, It works with C++, Delphi*, or Visual Basic*. For example, you can modify the GroupWise client toolbar or define new record types in the GroupWise information store. Now the OnReady, OnDelivery, and OnShutDown events can all be handled in a C3PO and you can, for example, replace the current interface for a message type, such as GW.MESSAGE.NOTE.

See the GroupWise SDK: Custom Third-Party Object (C3PO).