This great chart is interactive. You can refocus the chart to a new subject by clicking Green icons in the chart or by clicking the name of a sibling, partner, or child. Switching to another person is instantaneous. When navigating within a chart, you can use their browser's back and forward buttons to retrace your steps.
From an unrelated person's main page, you can get their Chart by clicking on the Pedigree Link button. Try it and see. Works a treat.