>We did some experimentation with sys(2015), when trying to decide the same question. This was under fpw 2.6. We found that 2 users can generate the same sys(2015) key within the same 1/100 th of a second.
>Also sys(2015) is time/date based, so if your master clock is reset backwards, sys(2015) will generate duplicates. Based on this info, we decided this was not a good primary key or unique indicator. This is probably still true of VFP.

Excatly, that's why we need a bullet proof mecanism which will work all the time. :)