Keyboard shortcut for PS(cs/cs2) layer comps?

As the titles explains , looking to see if there are keyboard shortcuts to shuffle through Photoshop (cs2) layer comps… i like to have my screen in full screen mode then hide all windows so to show head designers/clients the artwork in all its glory… but for variations i need to show the top bar to go through the layer comps which is annoying.

any ideas?