Unit Attack/Defense Power

[jakobrogert]

Hi! I'm trying to accomplish a Warhammer 40k mod and I found the available tutorials of great use, but they do not explain what an SFTypes' Attack and Defense power against the different Unit types actually does. Is it a to-hit percentage? Or are they completely relative? What difference does it do to combat if my Ork Tank has Attack Power 200 or Attack Power 10 against Infantry Type units?
If this question has already been answered I apologize, but I could not find it.

So, I finally found the numbercrunching threads (linked in case anyone else wonders):
tm.asp?m=1604485
tm.asp?m=1604539