INT 6F - 10NET v5.0 - ENUMERATE USERS OF SHARED DEVICE                          
	AX = 9504h
	BX = zero-based shared device index
	CX = zero-based user index
	DS:SI -> server's node ID
Return: CF clear if successful
	    ES:DI -> node ID of the CX'th user of the BX'th device
	CF set on error
	    AX = status (see #03740)
SeeAlso: AX=9501h,AX=9502h,AX=9503h