Int E0  - Dr Multiuser Dos - "a_set" - Set Default Aux Device Number       [O]

   CL = A8h
   DL = auxiliary device number

Return: AX = status
       0000h successful
       FFFFh failed
   CX = error code
Desc:  specify which physical device will become AUX

See Also: INT E0/CL=A5h,INT E0/CL=A9h