There are two files namely tcpbeui.os2 and nbtcp.exe and the following steps has to be taken to replace them.
1.Replace the existing  TCPBEUI.OS2 (in ibmcom\protocol) with the provided one.
2.Since nbtcp.exe is an active process(always running), following steps are necessary to
replace the existing one.
        i) Reboot the machine and when OS2 is getting loaded,go to the safe mode by 
           pressing ALT+F1
       ii) From there go to the command prompt by pressing F2.
       iii) In the command prompt change to the directory \ibmcom\protocol and rename the                                  original NBTCP.EXE to NBTCP.ORG
       iv) Then copy the new NBTCP module in the same directory.
3.Then press ctrl+alt+del to reboot the machine and let the machine boot through the normal mode this time.
4.Now the new modules ( nbtcp.exe and the tcpbeui.os2) are in place and active.






