[python-win32] Detecting when the Windows screen saver comes on

[happybrowndog]

Hello,

Does anyone know how to detect when the windows screen saver comes on? 
Any other kind of detection of windows being idle (ie: sleep or 
whatever) would also be useful if you happen to know it.  I'm basically 
looking for whatever is easy to implement.  My wxpython chat application 
  needs to know if the user has gone "idle" by detecting whatever 
windows event will tell me that.

Thanks.