Locking is meant to insure that no one changes the database while you are in the
process of changing it via importing a classlist --- e.g. you do not want a
student to change their email address or another Professor to change a student's
name and then have you overwrite the change.
The normal mode for the database is unlocked --- this means it can updated over
the web (e.g. students can change their email addresses, Prof's can add new
students, etc). What can not be done when the database is unlocked is to either
export it to or import it from a classlist file. If you lock the database, then
export it to a classlist file, you are assured that the classlist database and
the classlist file are identical.
So keep the classlist database unlocked except when you want to either export
the classlist database to a classlist file or you want to import the classlist
database from a classlist file. Importing automatically changes to mode to
unlocked after the import since unlocked is the normal mode.
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