is a powerful and highly configurable desktop window manager for the X Window system. It supports any number of virtual desktops, each divided into multiple pages. It also supports side title bars, including vertical text.
When you install FVWM on PC-BSD, it also installs . Both window managers will be added to the login menu.
Figure 6.8a shows the default PC-BSD desktop if you select FVWM from the login menu. The application menu was opened by clicking the mouse anywhere on the desktop.
Figure 6.8a: FVWM Running on PC-BSD
Figure 6.8b shows the default PC-BSD desktop if you select FVWM-Crystal from the login menu. To open an xterm in FVWM-Crystal, right-click any area of the desktop.
Figure 6.8b: FVWM-Crystal Running on PC-BSD
 provides a good overview of the features and configurable options for FVWM-Crystal.
The  provides further information about configuring FVWM.