Check out "secret keys" in the guide or online here
http://www.empirisoft.com/medialab/h...navigation.htm
Ctrl + Left Arrow: Go back to previous question in a questionnaire
Ctrl + Right Arrow: Skips to next question in a questionnaire
Shift* + Alt + Right Arrow: Quits the questionnaire or other current file
Ctrl + Alt + Right Arrow: Quits the experiment in progress
Note that in later releases of v2006 the SHIFT key became required to advance to the next file or questionnaire. This was to deal with the fact that users were often hitting alt+right to advance a page in an HTML item.
Note also that in some cases, you may need to click on the black border surroundng a MediaLab item in order to activate the secret keys.