Console Button

[Carlos Pereira <carlos pehoe civil ist utl pt>]

Hi,
I would like to implement a console button: when pressed, the window 
that launched the app (where printing messages are shown) comes on top,
when pressed again, the window goes back quietly and the app is refreshed.
Of course, many windows can be open at the same time, so it is necessary
to know which one is the right one, and then, somehow, to inform the window
manager to change the window priority... how can this be done? 
Many thanks for the help!

Carlos Pereira,
Technical University of Lisboa,
Portugal