FVWM, the F Virtual Windows Manager, is a window manager for computers running the X Window System. While KDE and GNOME offer more features, they are also heavy on memory usage. FVWM is light and fast, and you can customize it to meet your needs, and apply these customizations throughout your organization.
The default FVWM screen is very basic -- just a simple blue desktop. Clicking anywhere with the left mouse button brings up a menu with a couple of built-in options, including xterm. You can also move around the virtual desktop by moving mouse cursor off the edge of the screen (you'll find there are nine 'screens' in a 3x3 grid). And there you have it -- simple, light, and very fast.
You want more? Let's put in some window control.