This function determines the GUID associated with a specific module handle.
CSSM_GUID_PTR CSSMAPI CSSM_GetModuleGUIDFromHandle (CSSM_HANDLE ModuleHandle)
A CSSM_GUID_PTR to a data structure containing the GUID associated with ModuleHandle. If the pointer is NULL, an error has occurred. Use CSSM_GetError to obtain the error code.