i wanted to map the windows key on a Dell Inspirion to a useful Linux key on my son's notebook. This can be done the following way:
Use xev command to capture the key code. Left windows button should be key code 115.
Than you can do the following:
xmodmap "keycode 115 = F20"
This maps left windows button to function key 20.
To have the Windows key-mappings enabled automatically every time you start X either put the xmodmap commands in your ~/.xinitrc file or, preferably, create a file ~/.xmodmaprc and include the xmodmap options, one per line, then add the following line to your ~/.xinitrc:
After that you can map the F20 inside your window manager to the function you like to use.
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