The X stack in .NET Drawer GTIN-13 in .NET The X stack

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The X stack generate, create ean13+5 none in .net projects iPhone X Window System 269 Graphical applications GTK Qt Tk Xlib X server Linux kernel Figure 8-1. Client/server environment Motif Other toolkits The X stack Computer netwo rks are central to the design of X. It is possible to run an application on one computer and display the results on a screen attached to a different computer; the ease with which this can be done distinguishes X from other window systems available today. Thanks to this capability, a scientist can run and manipulate a program on a powerful supercomputer in another building or another country and view the results on a personal workstation or laptop computer.

For more information refer to Remote Computing and Local Displays on page 270. When you start an X Window System session, you set up a client/server environment. One process, called the X server, displays a desktop and windows under X.

Each application program and utility that makes a request of the X server is a client of that server. Examples of X clients include xterm, Compiz, gnome-calculator, and such general applications as word processing and spreadsheet programs. A typical request from a client is to display an image or open a window.

. The roles of X EAN13 for .NET client and server may be counterintuitive tip The terms client and server, when referring to X, have the opposite meanings of how you might. think of them intuitively: The server runs the mouse, keyboard, and display; the application program is the client. This disparity becomes even more apparent when you run an application program on a remote system. You might think of the system running the program as the server and the system providing the display as the client, but in fact it is the other way around.

With X, the system providing the display is the server, and the system running the program is the client.. Events The server als o monitors keyboard and mouse actions (events) and passes them to the appropriate clients. For example, when you click the border of a window, the server sends this event to the window manager (client). Characters you type into a terminal emulation window are sent to that terminal emulator (client).

The client takes appropriate action when it receives an event for example, making a window active or displaying the typed character on the server.. 270 8 Linux GUIs: X and GNOME Separating the physical control of the display (the server) from the processes needing access to the display (the client) makes it possible to run the server on one computer and the client on another computer. Most of the time, this book discusses running the X server and client applications on a single system. Remote Computing and Local Displays describes using X in a distributed environment.

. optional You can run xev (X event) by giving the command xev from a terminal emulator window and the n watch the information flow from the client to the server and back again. This utility opens the Event Tester window, which has a box in it, and asks the X server to send it events each time anything happens, such as moving the mouse pointer, clicking a mouse button, moving the mouse pointer into the box, typing, or resizing the window. The xev utility displays information about each event in the window you opened it from.

You can use xev as an educational tool: Start it and see how much information is processed each time you move the mouse. Close the Event Tester window to exit from xev..

Using X This section p rovides basic information about starting and configuring X from the command line. For more information see the Xserver man page and the man pages listed at the bottom of the Xserver man page..

Starting X from a Character-Based Display Once you have logged in on a virtual console (page 149), you can start an X Window System server by using startx. See rc-sysinit task and inittab on page 439 for information on creating a /etc/inittab file that causes Linux to boot into recovery (single-user) mode, where it displays a textual interface. When you run startx, the X server displays an X screen, using the first available virtual console.

The following command causes startx to run in the background so you can switch back to this virtual console and give other commands:. $ startx &.
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