Using the GNOME Control Center to select a new window manager
Click the toolbox button on the launch Panel.
Click Window manager under the Desktop entry.
Select the twm option in the box on the right.
Click the Try button.
Click the Save session later button.
This completes the simulation.
The Gnome Control Center allows you to configure various parts of your system using a collection of tools called "capplets".
These capplets may be associated with the core set of Gnome applications or other applications for which the developers have written capplets.
Your Control Center may contain more capplets than are documented here depending on the applications installed on your system.
Control Center is a part of Gnome desktop environment; it is included in control-center package.
You may start the Control Center one of three ways. To launch the Control Center without any particular active capplet select the Control Center menu item from the Settings submenu in the Main Menu or type the command gnomecc at the command line prompt.
If you know which capplet you would like to edit you may start that capplet by selecting the correct menu item in the Settings menu.