Yes very good questions Nebuchadnezzar.

I'd like to see a response to those.

And just to be clear.

There is a ONE TIME ONLY requirement to register the copy with Steam? Not a one time per single player session?

That means; I install the game from DVD or CD; install the "Steam" client as part of that install process; then register the game; then shut "Steam" down and play happily ever after wards; unless I see a patch of course in which case; I start "Steam" up again; download the patch; then shut "Steam" down again?

Correcto?