I looked up '_' in PBP's index and it referred me to (underscore). Looked up 'underscore', subtopic 'best practice' : p.473:

Use underscores to improve the readability of long numbers.

No reference to the file operations in any of the other subtopics in the index either.

This signature will be ready by Easter

In reply to Re^3: What does _ mean? by jvector
in thread What does _ mean? by bichonfrise74

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