In the keyboard system in the Windoews embedding, "critical keys" are keys that are considered important, so that their factual status are checked at every event using GetKeyState.

For now, only L/R Shift keys and L/R Control keys are added for pressing checks, and 3 lock keys are added for toggling checks. We might consider adding the following keys:

• AltGr
• Input method keys (JP & KR)
• Shift locks

Test them on actual hardware before adding.

This is an issue for a TODO.