General :: One User At A Time - Prevent Multiple Users Accessing The Database

Twice a year, a database of mine is accessed and put too use by various staff within a time range of 1 week. the database is on a shared drive and in a location which can be accessed by all.

The staff access the database from different workstations and in some instances at the same time.

This has only led to issues in the database being copied and then confusing staff on what database to click on thus i have 2 databases which i then have to sift through and copy/paste into the correct one.

I want to know the best way i can:

1) Prevent multiple users accessing the database at a time.
2) making a copy of the original and typing into a separate database.