The Help plugin provides some user documentation which looks as follows:

Help plugin: default view

The contents of the documentation is the same as the one which can be found in the user documentation section of the OpenCOR website. This includes a menu which gets shown whenever you move your mouse pointer over the information icon (top right):

Help plugin: context menu

In addition to what is shown on the website, the Help plugin also displays special links which when clicked send a command to OpenCOR. For example, open the current page both in OpenCOR and on the OpenCOR website. Now, if you check the bold text below, you will see that its contents is slightly different, depending on whether you are reading this in OpenCOR or from the OpenCOR website:

To open the About box, you can either select the Help | About... menu or click here...

Tool bar
Home Go to the home page
Back Go back
Forward Go forward
Copy Copy the selection to the clipboard
Normal Size Reset the size of the help page contents
Zoom In Zoom in the help page contents
Zoom Out Zoom out the help page contents
Print Print the help page contents