Format of License Service SLSREQUEST structure:
Offset	Size	Description	)
 00h	DWORD	(ret) status code
 04h	DWORD	(ret) handle identifying context
 08h	DWORD	(call) address of Publisher string
 0Ch	DWORD	(call) address of Product string
 10h	DWORD	(call) address of Version string
 14h	DWORD	units required
 18h	DWORD	address of comment string
 1Ch	DWORD	address of SLSCHALLENGE structure (see #02851)