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A useful feature of Linux is the virtual consoles. When you first log into a Linux system you are on the first ``virtual'' console of the system. On a standard Linux system you have eight virtual consoles. This is configurable, but we won't discuss that right now. Using the three key combination <Ctrl><Alt>F(n), where F(n) is one of the function keys between F1 and F8, you can move between these virtual consoles. If you are in X when you do this, F7 becomes your X session, and you will see the error output from the X server, in virtual console 1 (VC1) when you go back to it. Virtual consoles allow you to do multiple things at the same time, in console mode.