This is a patch that modifies the Flash Netscape and ActiveX plugins to keep them in fullscreen when focus is lost. It makes it possible to operate another application when watching Flash video in fullscreen on a multi monitor setup. You can still close fullscreen with the usual methods (Escape key, UI elements). The patch is tested with Flash version 10.0 and 10.1 in Opera, Firefox, Chrome and Internet Explorer. It might also work for previous and/or future versions.