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the use of File-Locking?
It's recommended that
you use this. It can happen that two visitors try to access for example
the download-script at the same time, one copy of the script is in the
process of writing the new database and the other copy of it wants to
open the file at the same time. This causes massive problems as you
can imagine. File-Locking can prevent this from happening. The first
instance of the script locks the file so that the other one can't open
the file, so no data will be lost if this happens. This sounds fine,
but the problem is that not all servers support it, especially NT-servers
are problematic. If you experience problems file-locking, try to deactivate