Getting data out of gtk_tree. How?

["Sergei O. Naoumov" <serge physics unc edu>]

Hi!
I am creating a tree structure that consists of strings. After the tree
is created by users, I'd like to dump this information into a file. So,
how do I get these strings back? I understand the general idea: I have
to go down on the tree but...

Thanks much,
			Sergei