Courses can be created for three different monitor sizes. 1) 9 inch screen (Mac Plus, SE, Classic) or a 12窶 color monitor 2) Powerbook screens 3) 13" monitors. Courses will run on the size they were created for and larger. Therefore a course created for a Powerbook screen will run on a Powerbook size monitor and a 13" monitor but not a 9 inch monitor. Course 1(9窶) and Course 2(9窶) were created for 9 inch monitors and therefore should run on any screen. Course 3(pb) and Course 4(pb) were created for a Powerbook screen and will run on a Powerbook or a 13 inch or larger monitor. Course 5(13窶) will only run on a 13 inch or larger monitor.