Super button in Lubuntu 16.04

We want to use the Super key (also known as "Windows key") to access  to Display the lxde menu and avoid depend so much on the mouse and gain some productivity in the handling of the computer.

Just add these lines to ~/.config/openbox/lubuntu-rc.xml file
<keybind key="Super_L">
    <action name="Execute">
        <command>lxpanelctl menu</command>
     </action>
</keybind>
And it's all OK.