For additional information please visit <http://homepage.mac.com/vanhoek/>
You need at least MacOS 9.1 to appreciate the renderer when running in Classic mode, and Carbon 1.2 when using carbon/OSX.
To get information on the various functions, properties and events, you should open the plugin with RBplugin Plunger, which is a REALbasic application of which the source can be obtained from <http://www.tempel.org/>
Be aware, in the classic environment there are some bugs related to the HTMLrenderingLib 1.0.4.
The carbon version appears to be bug-free, but an extra sample project has been added that contains resources required to do a build. As soon as REALsoftware has fixed a RB-related bug, the resourses are not required anymore.
If you run the sample project, do a "new" and open the .index file in the folder HTMLSample Help.