This keyboard has only one super key, so I want to remap the menu key to make up for that.
xev to find the keycode for the key you want to remap. For example if I press Menu key it tells me that that is keycode 135.
Next in my
~/.xmodmaprc file, I add a line like this:
keycode 135 = Super_R
... to make it the right hand windows key. Then all that remains is to activate the key remaps. This usually happens automatically on login to your x session, but if your Desktop Environment doesn't do that you can run it manually as
xmodmap ~/.xmodmaprc from a command line or whatever script gets run when you login.
I don't know what system you use, but if it is quite modern login as root, go to
Copy (make a backup)
evdev file. Edit it. Find the line with Menu Key and change its alias to super key (left or right) e.g. change
alias <MENU> = <COMP>;
alias <MENU> = <SUPR>;
Logout, login (
X11 has to be restarted), enjoy your new keyboard.