I am working on a project for medical research. This is a reaction time study. The beginning is for inputinging test id. This is to be followed by an instructional avi. media_play is a background process and following instructions continue without waiting for the end of the avi, I know there are prior posts on this problem. There are so many posts in this forum that I don't know where to look. Can anyone direct me to the appropriate post? I need my test complete by June 1 as I hope to take it to China.

Thank you.