Int 2F Fn D104  - Mdebug Command Driver - Execute Key In The Interpreter   [G]

   AX = D104h
   DS:SI -> MDEBUG data structure (see AX=D102h)

Return: AL = FFh
   AH = return code
       00h key processed, read next key
       01h leave MDEBUG popup session
       02h leave MDEBUG popup session and automactically popup again if
       DOS is not busy
       03h signal an error (beep)
       04h driver has redefined the key, proceed with the new key
       BX = new key code
       MDEBUG won't pass the new key to the command driver(s)
       05h put new command line into the input buffer
       DS:SI -> new command line (ASCIZ string, max 66 chars)
       06h process new command line
       DS:SI -> new command line (ASCIZ string, max 66 chars)
      else treat like code 00h

Note:  this function must end with a far call to the old INT 2F handler if the
     driver does not support the key in BX.  Otherwise, the driver must
     not chain to the old INT 2F.

See Also: AX=D103h