Int 2A Fn Sect  - Network - Installation Check                             [!]

   AH = 00h

Return: AH <> 00h if installed
   CF set if NetWare v2.15 NetBIOS emulator installed

Note:  supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET,
     etc.

See Also: INT 5C"NetBIOS"