Simple way to Check for a Key Release

Programming Help
1

After going through the documentation i am still not clear how to check for the release of a specific key. Is there a simple way to do that? I would like to present stimuli only once specific keys are pressed, and have a selection correspond to the key that was released.

Thanks in advance.

2

As nobody so far answered, a polite reminder that your lab can sign up for paid priority support to get such questions answered, as described at the top of the forum.
-mario