What The X Window System Core Protocol Does Not Specify
The X Window System core protocol does not mandate over inter-client communication and does not specify how windows are used to form the visual elements that are common in graphical user interfaces (buttons, menus, etc.) Graphical user interface elements are defined by client libraries realizing widget toolkits. Inter-client communication is covered by other standards such as the ICCCM and freedesktop specifications.
Inter-client communication is relevant to selections, cut buffers, and drag-and-drop, which are the methods used by a user to transfer data from a window to another. Since the windows may be controlled by different programs, a protocol for exchanging this data is necessary. Inter-client communication is also relevant to X window managers, which are programs that control the appearance of the windows and the general look-and-feel of the graphical user interface. Yet another issue where inter-client communication is to some extent relevant is that of session management.
How a user session starts is another issue that is not covered by the core protocol. Usually, this is done automatically by the X display manager. The user can however also start a session manually running the xinit or startx programs.
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