Using include-file

Do you know practical cases of using "include-file" in programs?
I can't imagine how this word could be used in standard programs.
Only one idea: to skip BOM (byte-order mark) before include the file contents.
Using other system-specific means, this word can probably be used to organize inter-process communication: when a file descriptor (e.g. a pipe) is passed from one process to another and used as the input source.  But why do you need to load Forth code this way?
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Ruvim