INT 2F - Novell NetWare - Advanced NetWare 4.0 DOS Requester - GET CALL ADDRESS
        AX = 7A20h
        BX = 0000h
Return: AX = 0000h on success (installed)
            ES:BX -> far call address for DOS Requester
Notes:  the DOS Requester replaces the NetWare Shell (ANETx, NETx) on
          NetWare LAN's as of the release of Advanced NetWare 4.0 (1993).  It
          is backward compatible with NetWare 2.1x through 3.11 servers as
          well.  Note that there was a NetWare 4.0 in the early 1980's, which
          can cause confusion.
        this call is used as the installation check by VLM.EXE, which is the
          loader for all the modules of the DOS Requester
Index:  installation check;NetWare 4.0 DOS Requester

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