How can I map the META key to the left "windows" key (Emacs)?

Per default the left "alt" key will be the META key in Emacs. When you like to change the META key to the left "windows" key add the following lines to your startup script (.login)

xmodmap -e 'remove mod4 = Super_L'
xmodmap -e 'remove mod4 = Hyper_L'
xmodmap -e 'add mod4 = Meta_L'