Window Previews Ever wondered how to activate a single window instead of a whole application? The Window Preview bubble shows you every single window of an application just by holding the mouse on a dock item! It even shows minimized windows and windows from other spaces and is fully drag & drop aware. With keystrokes and clicks to dock items). Description Official Web Site: HyperDock is a cool Preference pane that allows you to control the dock better (like quick kills, hide, restart, get info., etc.