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Here are some of the key points from the certification objectives in Chapter 6.
The X Server is the software that manages the graphics display on the local computer, which includes your monitor/graphics adapter, keyboard, and mouse.
X Servers work with local and remote X Clients to keep your display up to date. X Servers send inputs from the keyboard and mouse to X Clients. Then X Clients send instructions to the X Server to update the graphics on the monitor.
You can configure the X Server during the RHEL 3 installation process. You can also configure or modify the configuration using the Red Hat Display Settings tool.
The X Server configuration is stored in the /etc/X11/XF86Config file.
If your X Font Server is not running, you won't be able to start the Linux GUI. Make sure it's set to run in your current run level, and that the /tmp and /home directory partitions are not full.
RHEL 3 supports a great number of X Client programs. These include terminal emulators, desktop accessories (such as the File Manager), and more.
You can send the display of an X Client program to a remote system by using the -display option.
By default, X Clients sends display output to the local computer.
You can send display output to other computers with the -display command line option.
The local system must be willing to accept your remote X Client. You can run the xhosts +remotepc command to accept remote X Clients from the computer named remotepc.
You can log into the remote client using the Secure Shell.
You can set the DISPLAY environment variable on the X Client computer to direct all display output to a remote X Server.
The X Window System just gives you a blank electronic canvas. The look and feel of a GUI is provided by the window manager and desktop.
The two main desktop environments are GNOME and KDE.
You can use switchdesk from a terminal window or the command line interface console to select your default desktop.
You can configure the X Window interface to start automatically, or you can start it manually from the command line console with the startx command.
You can customize the startx process by configuring X Clients in the ~/.xinitrc or the Sessions manager.
You can set up graphical logins with the X display manager, the KDE display manager, or the GNOME display manager.
The default RHEL 3 Web browser is Mozilla. The default graphical e-mail client is Evolution.
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