vdesk is a virtual desktop manager, intended for use with window managers that don't provide virtual desktops themselves. It works by mapping and unmapping (i.e. showing and hiding) windows itself when you invoke it to change desktops.
Jason Lin pointed out that you can use vdesk with some window managers
that do support virtual desktops — such as XFCE's xfwm4
— in which case it will add another "dimension" of virtual
desktops (giving you an N by N grid of desktops, rather than an N-long
This might be useful if you want to have different sets of desktops for
configuration has launchers configured to do things like
3 && firefox to launch programs on specific virtual desktops.