Help with HTM please

[rookie]

Hi, how could I make a progress box,
something like this but without creating a new window every time:

int i
for(i 0 5)
MsgBoxAsync i "Progress meter"

The code above would create five different boxes.
Is there a way to send text to just one box, as the loop goes by?
It does not have to be by using MsgBoxAsync,
it could be any other message box.

Thank you.