INT 2F - Novell NetWare - TCP/IP Protocol Stack - INSTALLATION CHECK
        AX = 7A40h
Return: AX = 7AFFh if installed
            BX = ???
                bit 0: ???
                bit 1: ???
                bits 15-2: ???
            CX = version (CH=major, CL=minor)
            DX = 0000h
            ES:DI -> entry point for TCP/IP stack (see below)
Notes:  Novell's LAN Workplace for DOS TCPIP.EXE also supports this interface
        this function is also supported by the Beame&Whiteside BWLWP40 shim,
          but it only returns AL and ES:DI, and does not support AX=7A41h
SeeAlso: AX=7A41h,INT 60"Excelan"

Call entry point with:
        ES:SI -> parameter block (see below)
        ???
Return: ES:SI parameter block updated

Format of parameter block:
Offset  Size    Description
 00h    DWORD   ???
 04h    WORD    (return) ???
 06h    WORD    (return) ???
 08h  4 BYTEs   ???
 0Ch    BYTE    flags???
 0Dh  7 BYTEs   ???
 14h    BYTE    (return) ???
 15h    BYTE    (call) ??? number, bit 7 set if ???
 16h    BYTE    ???
 17h    BYTE    (return) result or error code
        ???

.