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Xlib
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<p>Xlib (also known as libX11) is an <a href="/facts/X_Window_System/ac2vRIQL">X Window System</a> protocol client <a href="/facts/Library_(computer_science)/xRzL3P7q">library</a> written in the <a href="/facts/C_(programming_language)/Ky2No763">C programming language</a>. It contains <a href="/facts/Subroutine/9vFJrg0A">functions</a> for interacting with an X <a href="/facts/Server_(computing)/dEaYFD7r">server</a>. These functions allow <a href="/facts/Programmer/WGTS1Jv9">programmers</a> to write programs without knowing the details of the <a href="/facts/X_Window_System_protocols_and_architecture/1AMaB1yE">X protocol</a>. </p><p>Few applications use Xlib directly; rather, they employ other libraries that use Xlib functions to provide <a href="/facts/Widget_toolkit/v8wM8wwy">widget toolkits</a>: </p> <ul><li><a href="/facts/X_Toolkit_Intrinsics/bD9XueHe">X Toolkit Intrinsics</a> (Xt)</li> <li><a href="/facts/X_Athena_Widgets/Q0ksLYxs">Athena widget set</a> (Xaw)</li> <li><a href="/facts/Motif_(software)/zEwd49VX">Motif</a></li> <li><a href="/facts/FLTK/a9R0RuQI">FLTK</a></li> <li><a href="/facts/GTK/oLpVm9pp">GTK</a></li> <li><a href="/facts/Qt_(software)/gVhwlQnJ">Qt</a> (X11 version)</li> <li><a href="/facts/Tk_(software)/Y6NBxcbF">Tk</a></li> <li><a href="/facts/Simple_DirectMedia_Layer/9tSff0Lg">SDL (Simple DirectMedia Layer)</a></li> <li><a href="/facts/Simple_and_Fast_Multimedia_Library/RwJfj05B">SFML (Simple and Fast Multimedia Library)</a></li></ul> <p>Xlib appeared around 1985, and is used in <a href="/facts/GUI/wBlQFWDP">GUIs</a> for many <a href="/facts/Unix-like/YAKrAxzd">Unix-like</a> <a href="/facts/Operating_system/8XTuvMh2">operating systems</a>. A re-implementation of Xlib was introduced in 2007 using <a href="/facts/XCB/fpbewG2N">XCB</a>. </p>