"The challenge for those who do a great deal of multitasking and
tend to have lots of windows open is finding a good way to manage
them on a small screen. One solution is to use multiple virtual
desktops which are supported by most Linux desktop
environments.
"PekWM offers an additional solution: window grouping. It allows
a variety of different applications to be grouped together in a
single window. Most everyone is familiar with tabbed browsing by
now. The same concept has been applied to terminal emulators with
different command line sessions accessible via tabs. Window
grouping takes this one step further. When window grouping is used
in PekWM the title bar in the window manager is segmented with each
section effectively acting like a tab."