It works as well as any other corner interaction on multiple monitors; closing a window on the rightmost screen isn't a novel movement. The charms bar can be on

It works as well as any other corner interaction on multiple monitors; closing a window on the rightmost screen isn't a novel movement. The charms bar can be on the right screen as well, so it's still a corner gesture you can't overshoot. Opening the charms bar on a desktop computer is a rare event anyway. The buttons it exposes are primarily touch interactions used when holding a tablet running a Metro app. In a classic application, you wouldn't be using its search/share/device buttons, and it's faster to just press the Windows key to do a system/web search.