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

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The "DebuggingScreenLocking/HowScreenLockingWorks" page has been changed by aquaherd:
http://wiki.ubuntu.com/DebuggingScreenLocking/HowScreenLockingWorks?action=diff&rev1=12&rev2=13

Comment:
Details for xubuntu added

  
  (This section needs to be completed.)
  
- = XFCE (Xubuntu, Mythbuntu) =
+ = Xfce 4 (Xubuntu, Mythbuntu) =
  
- (This section needs to be completed.)
+ Screen locking is handled by the `xflock4` script that is a small command dispatcher to the following commands:
+  
+  * `xscreensaver-command` when found `xscreensaver` running
+  * `gnome-screensaver-command` when found `gnome-screensaver` running
+  * `slock` when available
+  * `xlock` when the above three options failed
+ 
+ First found from the above will be called with the appropriate parameters.
  
  ----
  CategoryBugSquad