M3 is the Option key on MacOS X, and the ALT key on most other platforms.
M1 is the COMMAND key on MacOS X, and the CTRL key on most other platforms.
M4 is the CTRL key on MacOS X, and is undefined on other platforms.
M2 is the SHIFT key.
The CTRL key, independently of the platform.
Note: In general
KeyModifier.CtrlCmd should be preferred over this constant.
An alias for the SHIFT key (
true if the argument represents a modifier. Otherwise,