The COURSE CATALOG option allows you to either select a subject directly
by typing in a subject number, or to browse through the subjects for a
specified course.  If you choose the latter, a list is displayed of all
the subjects in the course.  Click on as many subjects as you want, then
press the NEXT SUBJECT button to start displaying the descriptions and
schedules.  

The PREVIOUS SUBJECT button backs up one subject, and the LIST SUBJECTS
button presents the list of all subjects for the current course.
