The System Tray The system tray is where programs that are run, but not directly needed are keeped. Some programs (like music players) are shown there, because you probably wants to keep them open, but so that it don't take too much space on your screen, it will put an icon in the system tray. When you right-click on such an icon, a popup menu will appear where you can see some options of the program (like play, pause, stop, ... in a music player) When you left-click on it, the main window of the program will appear. If you hover your mouse above the icon, a tool tip will appear with some information (in the music player case information like the current song) Programs that normally support system tray icons are music players, irc clients, organizers, ... In most of these programs you can configure if you want an icon to be shown or not.
PS: I'm Simon Vermeersch, and I forgot to tell this in my two other mails (also from titeuf at ph34rus.org)
