wrt : unusual concepts and techniques via external shell tasks

[dubiouscript]

It can be difficult for experienced developers to become proficient in working with TiddlyWiki's code: besides requiring a good understanding of JavaScript, the internals are built around relatively unusual concepts and techniques that are likely to be unfamiliar to most.

#3461 # Add support for running external shell tasks

@*
are any good write ups articles or other documentation or just a list of these

unusual concepts and techniques that are likely to be unfamiliar to most.
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