Click to see Map. If you click and it doesn't appear, check your taskbar (top or bottom of screen usually) to see if that window is already open.
Space efficiency is a balance of the students' browser versions and the amount of information available on the screen at a time. For example, if a student's browser is an older version which cannot use frames or which cannot open separate windows, then the class website must resort to uses of screen space based on perceptions one and two.