Main Page | See live article | Alphabetical index In computing, a window is a portion of a computer screen, usually rectangular in shape, showing the output of and allowing input for one of a number of simultaneously running computer processes. The size and position can normally be adjusted, for example covering the whole screen, or half the screen, allowing another non-overlapping window using the other half, etc. Windows are a popular feature (or widget) in several graphical user interfaces. The X Window System and Microsoft Windows are named after this feature. In computer networking, a window is the amount of data that can be transported before a source must give an acknowledgement (ACK) to the sender. See also Window manager. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.