catching Glib::SignalProxy1< bool, GdkEventKey* > signal_key_press_event()

[Bartek Kostrzewa <bartek runbox com>]

I would like to catch from the main window of my application (unless
that proves to work differently than I assume it will)

Glib::SignalProxy1< bool,GdkEventKey* > signal_key_press_event();

but I have no idea how to determine which key was pressed, how do I do it?

thanks,
Bartek