Reading this section is not necessary for programming with Gforth. It should be helpful for finding your way in the Gforth sources.
The ideas in this section have also been published in the papers
ANS fig/GNU/??? Forth (in German) by Bernd Paysan, presented at
the Forth-Tagung '93 and A Portable Forth Engine by M. Anton
Ertl, presented at EuroForth '93; the latter is available at
`http://www.complang.tuwien.ac.at/papers/ertl93.ps.Z'.