Glossary of common terms

Location: Flat file edit settings link in Administration > Courses > Enrolments

A flat file allows enrolment management (enrol or unenrol) of existing users in existing course. The file is read one time by Moodle then erased. The file is located in the moodle file structure as a text file and Cron provides the timing when it is read.

http://docs.moodle.org/en/Flat_file