Widgets across windows

[Eric Lesh <eclesh pacbell net>]

I come from Visual Basic, so please forgive my twisted view of gtk 
programming ;-)

I have a window wndMain with a button btnRand.  When btnRand is pressed, 
it is supposed to generate a random string, place the random string in 
rndstr, and then place the value of rndstr in rndbox, a text box on form 
wndRand.  When I use:
   GtkWidget *rndtxt, *wndRand;

   wndRand = create_wndRand();
   rndtxt = lookup_widget(GTK_WIDGET(button),  "rndbox");

and run it, I get the error "** WARNING **: Widget not found: rndbox" 
In my experience with Visual Basic, you have to specify that the widget 
(rndbox) is on a different form than the button (btnRand).  If I do have 
to do this, what is the code to do so?

Gxis posxte
-Eric