Download and extract DOS drivers for your network card to a directory accessible via your Windows 2000 or XP DOS boot choice.
Boot to your Windows 2000 or XP DOS boot choice.
Run the setup file to install the client using the built in options to install the DOS drivers for your network card and one of the protocols used on your network.
If this results in insufficient conventional memory for non network enabled DOS games move the lines in c:\autoexec.bat containing a path equal to the install path you entered in the above setup to a file called netd.bat in
one of your path's directories.
This will enable you to boot up with near your original largest executable program size (slightly smaller due to added command to load a .sys file in config.sys).
Once booted enter netd at a DOS prompt to engage the network support when needed.