This function will create a guaranteed unique identifier.
retval = RTI_CreateGUID()
A unique identifier.
The RTI_CreateGUID function is a front-end for the CoCreateGuid API call in the OLE32.dll. MSDN Link.
* The following example will create 3 unique identifiers. Declare function RTI_CreateGUID id1 = RTI_CreateGUID() id2 = RTI_CreateGUID() id3 = RTI_CreateGUID()