Int 03 Fn 0911  - Soft-ice - Back Door Commands - Execute Soft-ice Comman  [G]

   AX = 0911h
   SI = magic value 4647h ('FG')
   DI = magic value 4A4Dh ('JM')
   DS:DX -> ASCIZ command string (max 100 bytes, 0Dh OK)