We use to have dedicated close button on 2.1 version of logitech revue. In honeycomb 3.1, I didn't see this option. Short cut Ctrl+W will close window. Thought might be useful for others.
On 2.1 I used to keep Home pressed and X out of window. If you keep Home pressed now, you get a nice window with all recent apps, I haven't tried it, but probably will close any open windows too.