python - What does this Release Modifier do? -

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i programming window manager x11 using python-xlib. far, used myself simplewm sqizit orientation, orientated @ plwm.

and in both wms, can find release modifier, defined as

release_modifier = xlib.x.anymodifier << 1

but in both, there no further explanation modifier does. haven't found on google either.

so, if xlib-expert explain me thing (i think should understandable c programmers well), i'd grateful :)

the reference find in sawfish wm programming manual, says

there 2 special modifiers: prefix matches set of modifiers; release modifier matches key-release events instead of default key-presses.


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