gtk_text_buffer_begin_user_action

[Ricardo Cruz <rpmcruz clix pt>]

Hey there,

 I am looking at the best way to implement undo on a text buffer (ie. the one 
that takes the least effort to do :)) and I don't quite understand the use of 
gtk_text_buffer_begin_user_action:
http://developer.gnome.org/doc/API/2.0/gtk/GtkTextBuffer.html#gtk-text-buffer-begin-user-action

 I don't get that explanation (notice that English is not my mother language). 
If someone could clarify it, it would be great. If someone has a an un/redo  
implementation handy, it would be even better. :P

Thanks,
 Ricardo
-- 
You may be sure that when a man begins to call himself a "realist," he
is preparing to do something he is secretly ashamed of doing.
		-- Sydney Harris