PHPSESSID Question

I have been trying to learn about sessions lately. I have been successful in start and destroying a session, but when I start a session right after destroying a session, I get the same PHPSESSID. I can actually watch the tmp file get deleted and then recreated only to get the same PHPSESSID. I tried from two different machines and went like this: Machine 1 = started session Machine 2 = started session Machine 1 = destroyed session Machine 2 = destroyed session Then I did the same process starting with Machine 2. I got the same PHPSESSID as I did for Machine 2 the first time. The only way to get a new PHPSESSID was to close the browser out. This quite frankly sucks. I would think a new PHPSESSID would be assigned after each and every destroy. Any thoughts? TIA, Shane