Get how long the mouse and keyboard have been inactive for, or reset the inactivity timer. This can be used to do things like preventing a screensaver from kicking in; [tkchat] uses it (in read mode) to set the user's status to "Away" when people are busy.

Other idle time tracking facilities:
   * [tkinactive] rip of the Tk 8.5 builtin idle tracking code for older versions of Tk.
   * [tkXwin] for older versions of Tk in X Window.
   * [tclWinidle] for older versions of Tk in Windows (including Win9x).

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