Data::UUID. Guaranteed unique. And if you are worried about  
performance (though it isn't really a problem), you can create one id  
for the process and just append a counter to it.


>
> I'm not sure if this is a good idea [perhaps someone else can  
> comment],
> but for the purpose of a session ID, you could combine MD5 with
> something like the IP address of the user.  Still not perfect since  
> two
> users might have the same IP address if they are behind the same proxy
> (I think...)...  And it also assumes you aren't interested if the same
> user returns later under a different IP address...
>
> Other options include the date of the initial visit (what are the odds
> of a trillion visits in one day?  :-) ).
>
> Ray
>


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