If DirectRT doesn't prompt for any missing parameters, this is something we can add to our future feature list. In the mean time, a possible work around would be to copy the bat file and assign each copy a different subject ID within the file. Then name it accordingly--the command line which launches a session for subject 53 would be called 53.bat, and so on. The you would just double click the batch file that corresponds to any given subject. Not the most elegant solution--but again, perhaps a temporary work around. Does that help?