Emma
In my experience, I very very rarely need to do anything with the "locking"
file. Access generally handles it.
The one exception has popped-up when Access dies an inglorious death and
forgets to clean up. In that one instance, the locking file is left hanging
after the application is closed (i.e., died). If you don't delete the
locking file in that instance, Access gets terribly confused.
Sometimes when I've tried to delete the locking file, Windows won't let me
.... and correctly so! If someone is using (i.e., has opened) an Access
application, you should logically NOT be able to kill the locking file.
Good luck!
Regards
Jeff Boyce
Microsoft Office/Access MVP