>>>In theory, yes
>>>In practice : no
>>>
>>>see http://stackoverflow.com/questions/39771/is-a-guid-unique-100-of-the-time
>>>
>>>and http://blogs.msdn.com/b/oldnewthing/archive/2008/06/27/8659071.aspx
>>
>>Some unlucky Internet users had that one once in their life. I believe I also had it. Chances like one in 16 trillions or less than being hit by a meteorite happened yesterday. I had two transactions in the same millisecond, which increased the chances of having a duplicate, and I got one.
>
>After reading the second link ( especially about the uniquifier ) I find that strange

Only quick-scanned, but I miss achoring on/for each core instead of the somewhat dubious "48 bits of computer identifier"