B1: How to use Buttons.
On many Jmol pages you will see either radio buttons or checkboxes. These run Jmol commands (scripts) that have been programmed by the page author. For example, at the bottom of this page there are:

that can be used to change the background color or cause the molecule to spin, respectively.

As an example, checking the box below will run a script to draw just the backbone of Protein G and display the core hydrophobic residues in Spacefill mode, colored CPK. Unchecking the box will restore the display.