What is RRDG and how does it relate to RPE?
RRDG stands for Rational Reporting for Document Generation. This is the document generation solution used by Rational tools that want to provide document generation capabilities from their own UI. RRDG does not provide a UI, it is the consumer products that provide that.
Current consumers of RRDG are IBM Rational DOORS 9.3, IBM Focal Point 6.4 and 6.5, IBM Rational Requirements Composer 2.x