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  Interrupt:   2Fh     Function:   B7h
 
  Title:       APPEND [Version 3.0+]
 
  Description:
 
     Allows an application to test whether APPEND has been installed.
     If APPEND is resident, returns the APPEND version, state, and the
     path used to search for data files.
 
     Input                                   Output
 
     AH = B7h                                If function successful
     AL = Subfunction                          Carry flag: clear
          00h = Get Installed State          And if called with AL = 00h
          02h = Get Append Version             AL = APPEND installed status
                [Version 4.0+]                    = 00h (if not installed,
          04h = Get Append Path Pointer                  OK to install)
                [Version 4.0+]                    = 01h (if not installed,
          06h = Get Append Function                      not OK to install)
                State [Version 4.0+]              = FFh (if installed)
          07h = Set Append Function          Or if called with AL=02h
                State [Version 4.0+]         [Version 4.0+]
          11h = Set Return Found Name          AX = FFFFh if MS-DOS 4.0
                State [Version 4.0+]           APPEND
                                             Or if called with AL = 04h
     BX = APPEND state (if AL = 07h)         [Version 4.0+]
                                               ES:DI = segment:offset of
          Bits   Significance (if set)             active APPEND path
                                             Or if called with AL=06h
          0        APPEND enabled            [Version 4.0+]
          1-12     Reserved (0)                BX = APPEND state (see above)
          13       /PATH switch active
          14       /E switch active          If function unsuccessful
          15       /X switch active            AX = Error code
                                    -♦-