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In the X Window System, the shape extension allows windows to be given arbitrary, non-rectangular shapes.

Two well-known applets that use the shape extension are oclock, which is a simple round analog clock, and xeyes, which shows two googly eyes that follow the cursor on the screen as if they were watching it. Most X Window systems have one or the other (or both) in their standard installations. In addition, some window managers use the shape extension to draw non-rectangular icons.

Applications can only create rectangular windows, but can then change their shape to be an arbitrary part of the original rectangle. The remaining area of the rectangle is not only transparent (shows what is below the window); rather, it is not part of the window at all. For example, if a window is shaped with a hole in the middle, not only the hole shows what is below the window, but a click in the hole is considered to be a click in what is below the window.

• East End AIDS garden gets spruced up
  CHARLESTON, W.Va. -- Jason Adkins didnt go to bed until about 5 oclock Saturday morning. But by 10 a.m., Adkins was standing in the middle of a flowerbed sprucing up the Living AIDS Memorial Garden on Charlestons East End. "I didnt realize there were ... Read more on this news related to 'Oclock'
• Fire causes heavy damage to Evanston home
  Calgary fire officials say a home in Evanston sustained heavy damage this morning when fire broke out just after 3 oclock. Fire crews arrived to find the front of the home  in the 300 block of Evanspark Garden  fully involved. A woman and her cat got out safely. The fire also forced the evacuation of neighbouring homes as a precaution which received some minor Read more on this news related to 'Oclock'
• Teen Hit by TTC Bus in East End Toronto
  Police confirm a teen girl has been hit by a TTC bus in the city's east end.  It happened around 9 oclock Tuesday night at the intersection of Lawerence and Kingston Road.  Police say she was taken to hospital with non life-threatening head injuries. The intersection was closed for investigation. Read more on this news related to 'Oclock'