>I tested this. As Gregory says the likilihood of getting two consecutive identical results is purely statistical. With a password length of 5 I get a duplicate once every 40-150K operations. With a password length of 10 I'm currently past 12,000,000 without a duplicate.
>I guess it shouldn't be hard to calculate the actual odds - but you get the picture.
>
>Even with a 5 character password does having one duplicate per several tens of thousands of instances really present a problem?
>And you're going to get duplicates anyway - why does the fact that they may be generated consecutively matter?

The issue is not about getting unique values on a long period. It is in regards to an issue I have when I need to include a default value for a username and a password in a page. Thus, I call the same method twice. So, I needed to avoid receiving the same values back.