INT 60 - MDEBUG - GET STATUS
        AH = 00h
        DS:SI -> password or a null byte
Return: AX = return code
            FFFEh password is invalid
            FFFDh display mode is invalid
           else successful
                ES = value of the monitor register SE
                DI = value of the monitor register OF
                CH = monitor color
                CL = interpreter color
                BH = monitor start line
                BL = interpreter start line
                AH = makecode of the hotkey
                AL = ASCII code of the hotkey
                DL = status of special keys (only SHIFT, ALT, CTRL) for the
                        hotkey (coded as for the keyboard flag at 0040h:0017h)
                DH = basic process number for the communication with drivers
                        process number for the display driver, DH+1 = process
                        number for the command driver(s)
        DS:SI -> MDEBUG identification table
Notes:  MDEBUG is a shareware memory-resident debugging tool by Bernd Schemmer,
          including a memory monitor, an interpreter, and a disassembler
        MDEBUG uses INT 60 by default, but may be directed to any of INT 60
          through INT 67; the interrupt handler is preceded by the signature
          "USERINT" and is not chained
        if DS:SI points at a null byte, MDEBUG will prompt for a password if
          passwords are active; enough stack space must be provided for an
          INT 10h call (which MDEBUG uses while prompting for the password)

Format of MDEBUG identification table:
Offset  Size    Description
 -2     WORD    entry offset
 00h    WORD    CS of MDEBUG
 02h    DWORD   old INT 08h vector
 06h    DWORD   old INT 09h vector
 0Ah    DWORD   address INT 16h routine used by MDEBUG
 0Eh    BYTE    length of version string
 0Fh  N BYTEs   version string