High Quality Content by WIKIPEDIA articles! xbiff is a small utility for the X Window System that shows a mailbox with its flag raised whenever the user has new e-mail. It is included in almost every X Window System. The X Window System (commonly X or X11) is a computer software system and network protocol that provides a graphical user interface (GUI) for networked computers. It creates a hardware abstraction layer where software is written to use a generalized set of commands, allowing for device independence and reuse of programs on any computer that implements X.

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