Int E0  - Real/32 - "l_cattach" - Conditionally Attach To Default List De  [O]

   CL = A1h

Return: AX = status (00h = successful, FFh = unable to attach)
   may destroy SI,DI
Desc:  attach the default list device to the calling process only if it is
     currently available

See Also: INT E0/CL=92h,INT E0/CL=9Eh,INT E0/CL=A0h