programming gnucash in scheme

[Jonathan A Rees]

I'm having a difficult time getting started programming gnucash in
Scheme (Guile).  I found 
  http://gnucash.org/lxr/gnucash/source/doc/guile-hackers.txt
but it doesn't really tell me enough.

In particular --

1. How do I start a Guile read-eval-print loop that's connected to
gnucash?  What's the best way to load Guile code into gnucash?

2. What are the gnucash-related procedures I get to use from Scheme?
The "constructing custom reports" page of the 1.4.9 documentation
refers to a source file src/g-wrap/gnc.html, which I am unable to find
in the online source tree at gnucash.org.

I'm interested in accessing the engine -- the GUI stuff doesn't
interest me (yet).

Thanks
Jonathan Rees