INT 2F RU - Borland C++ 3.0 DPMILOAD.EXE - INIT DPMI HOST AND SPAWN SUBSHELL
        AX = FB42h
        BX = 000Ah
        CX = 0001h
        DX = ???
        SI = ???
Return: after user exits subshell
Notes:  this call is used by DPMIRES; unlike most of the DPMILOAD calls, this
          function is not available in protected mode.
        the BC2.0 version of DPMILOAD is purely a DPMI loader, while the BC3.0
          version also adds a DPMI host and DOS extender.
SeeAlso: AX=FB42h/BX=0015h