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Window List applet minimizes its window, and clicking on the name again maximizes it. Clicking another application switches you to that one, of course. The Workspace Switcher lets you transfer windows from one workspace to another for better organization. Workspaces are virtual desktops that you can use for managing application windows. If you find your current desktop workspace too cluttered, you can move some of the windows to the next workspace by dragging them there or by using the Move to Workspace right (or left) option. You can find this option by clicking on the upper-left button on a window.
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Figure 6-17. The Bottom Panel with applications You can learn more about the GNOME desktop environment by visiting http://www.gnome.org.
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I discussed earlier that the X display manager is responsible for starting and ending an X session to connect the client to the server. If you are using CentOS with the GNOME environment, you use the login screen to start a GNOME session to access your desktop. That screen is GNOME's display manager, the replacement for the original X display manager. Instead of providing just the essentials for starting an X session, the GDM is framed by GNOME desktop components. The GDM can also use the X Display Manager Control Protocol (XDMCP) to let other X servers start a session within the X server it s running on. With XDMCP, you are actually using the remote server s desktop while working on your own computer. It is like pulling a GNOME session from the remote computer into your computer. When another X server wants to connect to your X server using GDM, the remote X server will send a query packet. If the GDM allows remote connections, it will send a willing packet back to the remote X server. After getting the willing message, the remote X server can request that GDM start a session from your X Server, as shown in Figure 6-18.
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Figure 6-18. Interaction between the GDM and the Remote X Server
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Caution: Be sure to enable access to the UDP port 177 to have successful XDMCP connections. You can do this by adding a rule on iptables allowing hosts to use port 177 on your system. You can also disable the firewall temporarily by turning it off using service iptables stop. Do this only in your practice computers on a secure network.
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GDM Configuration
The GDM has a configuration file called custom.conf that is located in /etc/gdm. This is where you enable remote X servers to create sessions with GDM. An example custom.conf file is shown in Listing 6-3. Listing 6-3. A Sample custom.conf File for GDM # # # # # # # For full reference documentation see the gnome help browser under GNOME|System category. You can also find the docs in HTML form on http://www.gnome.org/projects/gdm/ NOTE: Lines that begin with "#" are comments. Have fun!
[daemon] [security]
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[xdmcp] [gui] [greeter] [chooser] [debug] # Note that to disable servers defined in the defaults.conf file (such as # 0=Standard), you must put a line in this file that says 0=inactive, as # described in the Configuration section of the GDM documentation. # [servers] # # # # # Also note, that if you redefine a [server-foo] section, then GDM will use the definition in this file, not the defaults.conf file. It is currently not possible to disable a [server-foo] section defined in the defaults.conf file.
The configuration file is divided into sections enclosed in square brackets. The sections include daemon, security, xdmcp, gui, greeter, chooser, debug and servers. These sections contain no options and it is up to you to set whatever options you need to alter the behavior of GDM. The configuration file contains guidelines on what options can be used in the sections in the form of comment lines that start with the hash symbol. Here is an overview of the sections and some of the things you can do with them in the custom.conf file: daemon: Controls the GDM daemon's execution. You can allow automatic or timed logins and change the GNOME greeting program, for example. Automatic logins let users log into GNOME without prompting for a password. Timed logins terminate a user s session at a certain time limit. You can also set the system user and group that GDM will use when running for better security and control. security: Defines how users can use GDM and can allow or deny remote TCP connections. You can, for example, use this section to prevent root logins from both local and remote users. You can also configure which PAM module to use with GDM for authentication in this section. xdmcp: Allows GDM to use XDMCP to let other X servers start a session on this computer; this is not enabled by default. gui: Lets you specify what GTK resource file (gtkrc) file to use on a running session to control the size of the icons or which theme to use. greeter: Lets you set the position of the login window, change its logo, or set the welcome message to show to the user. chooser: Controls what is displayed when the user runs the XDMCP chooser from the system menu. Choosers list available X servers on the network with XDMCP that users can connect to. debug: Makes GDM generate debugging messages in the system log that you can examine if you are experiencing problems with GDM. servers: Lets you define the number of standard servers that can run on your system. A standard server is the local X server that runs on this computer. Currently, there is 1 defined in this section as 0=Standard. This means that the first local X server on this computer holds the display number :0. Adding an option to a section requires the syntax:
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