Int 21 Fn 5FCC  - LANtastic V4.1+ - Get/set Server Control Bits            [N]

   AX = 5FCCh
   ES:DI -> ASCIZ server name in form "\\machine"
   CX = bit values (value of bits you want to set) (see below)
   DX = bit mask (bits you are interested in, 0 = get only) (see below)

Return: CF clear if successful
       CX = control bits after call
       bit 0: disable logins
   CF set on error
       AX = error code

Note:  you must have the "S" privilege to SET, anyone can GET.