Compatibility: 4.0+
Expects: AX    b702H
                                                                  
Returns: CF    Carry Flag clear (NC) if no error
AX    ffffH means this version compatible with DOS 4.0+
                                                                  
Info: Returned values other than ffffH indicate some version older than
that of DOS 4.0.

The interface to APPEND.EXE has not changed, up to and including
DOS 6.0.

- -

INT 2fH b702H: Get APPEND.EXE Version