I have been asked to develop a mechanism to change a user's group
membership using Visual Basic.

Has anyone done this?

Where do I find info or sample code?

Thanks

Look for ADSI in MSDN. It will provide you with a very easy to use set of
high-level methods that you can use in VB.
Sample code can be found on msdn.microsoft.com, searching for "ADSI".

Good luck
Olivier