Checking whether Gnome screensaver currently active

[JB]

Robert Nichols <rnicholsNOSPAM <at> comcast.net> writes:

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http://live.gnome.org/GnomeScreensaver/FrequentlyAskedQuestions
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Is there a way to perform actions when the screensaver activates or deactivates?
Or when the session becomes idle?
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http://people.gnome.org/~mccann/gnome-screensaver/docs/gnome-screensaver.html
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Examples
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JB