Originally Posted by Jedinovice
But what are 'WM's?
WM's are window managers. Unlike a full-blown desktop environment such as KDE or GNOME, window managers only manage windows. They don't provide things like desktop icons, file managers, etc. To get those, you have to install programs yourself, like iDesk or thunar. Some WMs are Openbox, Fluxbox, Xmonad, awesome, and dwm.