The idea is to try to get them all in as soon as (reasonably) possible, to improve the chances of the inquiries not showing.
does the three browser method mean only one credit pull for sure?
I always thought that the inquiries are reported once a month to the credit bureaus? So if someone applies for three cards in one hour they should be fine?
Current balance is reported once a month, inquiries aren't "reported", once there's an inquiry, well, they've inquired so the bureau obviously knows!