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Leo automatically loads all @<file> trees when you open a Leo outline, and
Leo writes any modified @<file> tree when you save an outline. Reading
external files is very fast because of an efficient file-caching scheme.

A single Leo outline may be connected to dozens of external files: this
makes Leo work like an Integrated Development Environment (IDE). Leo
outlines act like project files. For example, one Leo outline,
leoPyRef.leo, contains @file trees for all of Leo’s core source files.
Another Leo outline, leoPluginsRef.leo, creates the external files for all
of Leo’s plugins, and LeoDocs.leo contains all of Leo’s documentation.

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