Int 7F Fn A0  - Alloy Mw386 - Get User Name                                [N]

   AH = A0h
   DL = user number (FFh = caller)
   DH = machine number for user
   ES:DI -> 17-byte buffer for ASCIZ user name

Return: CF set if invalid user number

See Also: AH=03h,AH=A1h