Anyone used the same AP(multiple entry) to re-enter the US twice?

[milli]

I\'ve a multiple entry AP which I\'ve already used it once and I\'m planning to travel again.

* Can I use the same AP as it is multiple entry?
* What happens the second time? is it any different from the first time? \'cause I remember they stamped in the bottom right box when I used it first time? Wondering where would they stamp this time?

Guys who have travelled twice using the same AP, please post your experience.

Thanks a lot.