>Is there a Windows API function that I can use to determine what Groups a User is a member of?
>
>I'm talking about the Users and Groups that are in the Windows NT User Manager.

This is easy if ADSI is installed on the machine:

oUser = GETOBJECT("WinNT://SOMEDOMAIN/someusername,User")
FOR EACH oItem IN oUser.Groups
?oItem.Name
ENDFOR