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Xlib (also known as libX11) is an X Window System protocol client library written in the C programming language. It contains functions for interacting with an X server . These functions allow programmers to write programs without knowing the details of the X protocol .
Beside Xlib, the XCB library operates more closely to X protocol. In particular, most clients use libraries such as Xaw, Motif, GTK+, or Qt which in turn use Xlib for interacting with the server. Qt switched from Xlib to XCB with the 5.0 release, but client programs were almost entirely unaffected by this change.
If the user wishes to use a colour that is not in the list, they would need to add their desired colour to the list. This list is then saved with the currently-open drawing. Usable fonts are listed in a configuration file. If the user wishes to use fonts that are not on the list, they would have to change the configuration file.
Xlib/XCB uses the protocol layer of Xlib, but replaces the Xlib transport layer with XCB, and provides access to the underlying XCB connection for direct use of XCB. Xlib/XCB allows an application to open a single connection to the X display server and use both XCB and Xlib, possibly through a mixture of libraries designed for one or the other.
The X.Org Server and xlib are the reference implementation of the X protocol, and is commonly used on Linux and UNIX; it is the fundamental technology underlying both the modern GNOME and KDE desktops and older CDE desktop environment; applications written for any of these environments can be run simultaneously.
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The fundamental communications mechanism in the Microwindows API is the message. A message consists of a well-known message number, and two parameters, known as wParam and lParam. Messages are stored in an application's message-queue, and retrieved via the GetMessage function. The application blocks while waiting for a message.
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