[Ubuntu Wiki] Update of "DebuggingScreenLocking/HowScreenLockingWorks" by mdeslaur

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The following page has been changed by mdeslaur:
http://wiki.ubuntu.com/DebuggingScreenLocking/HowScreenLockingWorks?action=diff&rev1=11&rev2=12

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  (Ref.: gnome-panel/panel-util.c in gnome-panel)
  
+ === "Lock screen" keyboard shortcut (usually Ctrl-Alt-L) ===
+ 
+ gnome-settings-daemon handles the keyboard shortcuts. When the "Lock screen" keyboard shortcut is pressed, gnome-settings-daemon performs the following actions:
+ 
+  * Checks if gnome-screensaver-command is available, or else falls back to xscreensaver-command
+  * Calls the appropriate command with the "--lock" parameter
+ 
+ (Ref.: plugins/media-keys/gsd-media-keys-manager.c in gnome-settings-daemon)
+ 
  == Screensaver Inhibiting ==
  
  Prior to Karmic, applications that wished to temporarily suspend the screensaver from coming up could periodically send the "poke" command to gnome-screensaver, either using the DBus API, or with the gnome-screensaver-command tool. This would cause gnome-screensaver to reset the idle counter, preventing it from reaching the preset value.