is it possible to have a function(like WinProc or TimerProc) that is part of a COM component, and have the client be able to supply code for it, like an event in VB? this is from SSubTimer. It contains a function called WinProc, but the "client" is able to put whatever code in by using SSubTimer_WinProc. How would I have a function that could act like this in C++? thanks