This KDE4 plasmoid lets you control the active window. Actions currently
available : Close, Minimize, Maximize, Shade/Unshade, KeepAbove,
KeepBelow. It was created at first to help users with KDE4 on small
devices (it's easier to click on a big button...) but it is actually great
even with a standart computer (just throw your cursor at the corner of
the screen to close your window, buttons are always located in the same
place on the screen, etc.).