A fresh approach to learning Context.

[John Culleton <john@wexfordpress.com>]

Context is built on pdftex and pdftex should be in most
instances a superset of plain TeX. So a plain TeX file should
compile on both pdftex and Context. This represents a radically
different way to approach Context. Start with something already
known to be workable and go from there. This is my new approach
to learning Context and I will ride this horse till it gets tired.

Following this idea I compiled an existing file with pdftex and then
with Context. With minor tweaks things worked. I did get one 
strange and apparently non-germane error message. I use
eplain.tex extensively. One line in eplain that works with plain and 
works
with pdftex causes an error message in Context thus:

! Use of \def doesn't match its definition.
l.79 \def\hpenalty
                  {\ifvmode\leavevmode\fi \penalty}%

This has nothing to do with my code. Something in eplain
doesn't work in Context. Everything else seems fine.

Can anyone suggest an explanation of the above error message?

JOhn Culleton