This button provides a quick way to getting help on a control of the Editor.
Press this button once and notice the change of the Windows cursor indicating
the system is ready for help. Move the mouse to the control object which you need
an explanation and then click the mouse on the object. This will bring up the
help window with the right document page.
Use the Context Help command to obtain help on some portion of the Editor.
When you choose the Context Help button, the mouse pointer will change to an
arrow and question mark. Then click somewhere in the Editor window, such
as a control button on an Editor. The Help topic will be shown for the
item you clicked.