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It is hard to remember each keyboard shortcut.
It is also hard to figure, what possibilities shortcut delivers.

Solution:
When modifiers are pressed, shown window with listed all shortcut related to pressed modifiers.

For example:
1. I press meta
2. Windows showing text:
a) Press left mouse to move cursor bellow window
b) Press right mouse to set size of window bellow cursor
c) Press tab to switch activity

When modifier are pressed or released, list will be updated or window (if no modifier was pressed) disappear.