Keypress event using a timer without interrupting the running process

Hi,

I am running a program.exe from MATLAB. While the program.exe runs, user interacts with it using certain keys (arrows, space, enter etc.).

I would like to use a timer to access the key pressed information during the first sub process associated with program.exe. Once this sub process is over, program completes running and I want the timer also to stop tracking the key press information grab.

I want the timer to start again once the program.exe continues with the next sub process and then stop when the sub process completes.

Any thoughts?

[Walter Roberson]

I wonder if you want http://psychtoolbox.org/ ?