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In computing, the X Window System (commonly: X11, or X) is a network-transparent windowing system for bitmap displays. This article details the protocols and technical structure of X11. ==Client–server model and network transparency== X uses a client–server model. An ''X server'' program runs on a computer with a graphical display and communicates with various ''client programs''. The X server acts as a go-between for the user and the client programs, accepting requests on TCP port 6000 for graphical output (windows) from the client programs and displaying them to the user(display), and receiving user input (keyboard, mouse) and transmitting it to the client programs. In X, the server runs on the user's computer, while the clients may run on remote machines. This terminology reverses the common notion of client–server systems, where the ''client'' normally runs on the user's local computer and the server runs on the remote computer. This reversal often confuses new X users. The X Window terminology takes the perspective that the X Window program is at the centre of all activity, i.e. the X Window program accepts and responds to requests from applications, and from the user's mouse and keyboard input. Therefore, applications (on remote computers) are viewed as clients of the X Window server program. The communication protocol between server and client runs network-transparently: the client and server may run on the same machine or on different ones, possibly with different architectures and operating systems. A client and server can communicate securely over the Internet by tunneling the connection over an encrypted connection.〔Client–server model * IBM 1994, pp.2-11 * Maguolo 2005 * Manrique 2001 * Stevens 1994, pp.430-433 * Quercia & O'Reilly 1993, pp.13-17〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「X Window System protocols and architecture」の詳細全文を読む スポンサード リンク
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