ALL_WINDOWS

Events are received not from the application toolkit layer, but from the device driver or windowing system subsystem; such notifications are 'global' in the sense that they are not broken or defeated by applications that participate poorly in the accessibility APIs, or not at all; however because of the intrusive nature of such snooping, it can have side-effects on certain older platforms.

If unconditional event notifications, even when inaccessible or "broken" applications have focus, are not required, it may be best to avoid this enum value/flag.