The RHG is a book that explains how the ruby interpreter (the official C implementation of the Ruby language) works internally.

To fully understand it, you need a good knowledge of C and Ruby. The original book includes a Ruby tutorial (chapter 1), but it has not been translated yet, and we think there are more important chapters to translate first. So if you have not done it yet, you should read a book like the Pickaxe firs

rhg.rubyforge.org/