old_contents: #!/usr/bin/env python
  
  import xfce4
  mcsC = xfce4.mcs.Client()
  channel = mcsC.add_channel("X")
  
  
new_contents: #!/usr/bin/env python
  
  import pygtk
  pygtk.require("2.0")
  import gtk
  
  def setting_changed_cb(a,b,c):
  	print "X"
  
  import xfce4
  mcsC = xfce4.mcs.Client()
  channel = mcsC.add_channel("X")
  channel.connect("setting-changed", setting_changed_cb)
  
  gtk.main()
  
subject: update mcs test a bit, adding callback