The two participants perform an experiment at the same time

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Hi Becca,
thanks so much for your response.
As far as I understand unfortunately it is not possible to define two keyboards (device) in an experiment in Windows and I must use another system.
Now I have another question, I put two keyboard component by the name of a_resp and b_resp each for a subject and I used this code at the End Routine to start the task when both pressed ‘space’ but it doesn’t work.

code
code1360×692 37.5 KB
I sought similar problems which happened for others like this but all of them where about getting two correct answer from a keyboard(response component).
Do you or anyone have an idea to solve this problem?

Thanks for any help.
Fazel