Open K-menu on Window key press event

Many KDE-users want to open their K-menu(default right side menu bar) when windows key(super key) is pressed.

Here is the best solution.

Steps:

1. Find the scancode for SuperKey. Open a terminal and type:
   xev
   
2. Press your SuperKey (Windows Key) and watch the scan code returned (mine is 133)
3. Map that scan code to a 'phantom key (F13)' With this test--type:
   
xmodmap -e "keycode 133=F13"

   You should get returned to a prompt with no message. Then, right-click on the KDE menu, choose Launcher Settings, Keyboard Shortcut, then click the wrench symbol. Press your SuperKey and F13 should appear. Click Apply.
   Test the menu by pressing the SuperKey--it should now appear.
   
4. Automatically create mapping on startup If the above worked, you now need to automate the key mapping on each startup. From the terminal window type:
   
cat << EOT >> ~/.kde/Autostart/xmod.sh
#!/bin/bash
xmodmap -e "keycode 133=F13"
EOT

sudo chmod 755 ~/.kde/Autostart/xmod.sh

   Thats it..Bingo...You are KDE-Power-User..