To illustrate this, we'll walk you through the use of these
tools with Emacs in a typical
build/test/debug cycle. For details on them, see
Emacs's own on-line help system; this
section just gives you an overview, to motivate you to learn
more.
Read and learn — not just about
Emacs, but about the mental habit of
looking for synergies between programs, and creating them. Try to read
this section as instruction in philosophy, not just technique.