just a small addition to VEL417’s post - you are located in Europe, right? Then the Belgian address is the way to go.
The procedure for e.g. North America would be a bit different, since there’s a seperate office over there.
Sure, it is OK to come and see us.
We are here every day from 8h30 till 12h15 and from 13h till 17h.
(May 1st and 2nd = holiday).
When you arrive at the front desk, ask for somebody from R&D, we’ll help you out.