Hi Rick,
The AutoCAD plot engine is used to create PDF and DWF output. RealDWG is for reading/writing the contents of a DWG file and doesn't contain any AutoCAD 'editor' functionality - no viewing, no plotting, not selection, etc, etc. Which means that you can't use RealDWG to create PDF and DWF output.
If you want plot output, you might consider licensing AutoCAD OEM instead, or you could try combining your RealDWG app with DWG Trueview which has a simple (albeit unsupported) COM API. Or you could use the DWF Toolkit to do your own translation to DWF - but that would be a huge amount of work for you.
By the way, if you're an ADN member, you're probably better submitting RealDWG questions through DevHelp Online on the ADN website. The userbase for RealDWG is relatively small (compared to AutoCAD), so I'm not sure you'll find many experts monitoring the forums.
Regards,
Stephen Preston
Autodesk Developer Network
Cheers,
Stephen Preston
Autodesk Developer Network