![]() ![]() ![]() ![]() Output toareas covered by other windows is suppressed by the windowsystem unless the window has backing store. If several children of a window have overlappinglocations, one of the children is considered to be on top ofor raised over the others, thus obscuring them. That is, partor all of the child window can extend beyond the boundariesof the parent, but all output to a window is clipped by itsparent. X provides graphics, text, and rasteroperations for windows.A child window can be larger than its parent. In thisway, an application program can create an arbitrarily deeptree on each screen. There isusually at least one window for each application program.Child windows may in turn have their own children. Allwindows, except for root windows, have parents. Each root windowis partially or completely covered by child windows. At the top of each hierarchy is a root window,which covers each of the display screens. A set of screens for asingle user with one keyboard and one pointer (usually amouse) is called a display.All the windows in an X server are arranged in stricthierarchies. A single X server can provide displayservices for any number of screens. There can be multiple screens for each displayor workstation. A screen is a physicalmonitor and hardware that can be color, grayscale, ormonochrome. You may find it helpful to referto the glossary, which is located at the end of the book.The X Window System supports one or more screens containingoverlapping windows or subwindows. Overview of the X Window SystemSome of the terms used in this book are unique to X, andother terms that are common to other window systems havedifferent meanings in X. ![]()
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