KDE’s visual effects for windows and menus technically dates back to KDE 3. Experimental programs like kompmgr provided drop shadows and transparency for windows, and the KDE desktop itself had built-in support for basic menu transparency, shadows, and other effects. With the coming of KDE 4, the number of effects has multiplied, and KWin (KDE’s window manager) is now on par with Compiz (a window manager with numerous desktop effects). Moreover, KWin’s primary advantage over Compiz is that it is part of KDE and integrates perfectly with the rest of the desktop. While support for Compiz has been added, there are still some outstanding glitches when run on top of KDE.