Data::UUID looks like something you could use (disclaimer, I have never used it myself). File locking can be tricky, so, if you decide to write the code yourself, do a little homework before, like searching here for "file locking", I like RE: File Locking for example.

In reply to Re: Re: Re: Re: Re: Item Identification in XML Files by mirod
in thread Item Identification in XML Files by Anonymous Monk

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