Int 2F Fn 5100  U - Odihlp.exe - Installation Check                        [N]

   AX = 5100h

Return: AL = FFh if installed
       BX = 0000h
       DX:SI -> signature string "ODI$HLP$"
Program: ODIHLP is a real-mode helper allowing the Windows for Workgroups 3.11
     protected-mode NDIS3 protocol to work with real-mode ODI drivers
     and LSL.COM

Note:  the returned signature string might be the first field of a structure

See Also: AX=C000h"LSL.COM"