INT 7F - Alloy MW386 - GET USER GROUP LIST                                      
	AH = FAh
	DL = user number
	DH = machine number (currently 00h)
	ES:DI -> 16-byte buffer for group list
Return: CX = number of groups
	ES:DI buffer filled with group numbers
SeeAlso: AH=F8h,AH=F9h