Hold Option or Command while clicking to activate the middle or right mouse buttons. When enabled, clicking on an inactive window will cause that mouse click to pass through to that window in addition to activating it. When enabled, creation of a new X11 window will cause X11.app to move to the foreground (instead of Finder.app, Terminal.app, etc.) Launching X11 will create Xauthority access-control keys. If the system's IP address changes, these keys become invalid which may prevent X11 applications from launching. If enabled, Authenticate connections must also be enabled to ensure system security. When disabled, connections from remote applications are not allowed.