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seeking CALL_EXTERNAL examples...

Hello all,

I am looking for some reference material or code examples (IDL and C)
which use the IDL call_external command.  Are there any good books which
thoroughly discuss external C and IDL programming in detail?  I'm not too
interested in programming graphics or widgets, just text-based I/O and
number crunching.  I am reading through Ch. 7 of the IDL External
Development Guide, but I'm finding quite a few pitfalls.

Many thanks,