INT 2F - License Service API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. - UPDATE
	AX = 7003h
	CX = license server index (0000h to 001Fh)
	DS:DX -> SLSUPDATE structure (see #02853)
	ES:BX = provider specific handle for the license context
Return: AL = status
	    00h not installed
	    FFh installed
SeeAlso: AX=7004h,AX=7005h


Format of License Service SLSUPDATE structure:
Offset	Size	Description	(Table 02853)
 00h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	(ret) status code
 04h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	(call) handle identifying license context
 08h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	(call) total units consumed
 0Ch	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	additional units required
 10h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	address of comment string
 14h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	address of SLSCHALLENGE structure (see #02851)