goldorack I think you are scaremongering.
Unmodded and modded players of DW CANNOT play together even now.
So yes you would need two installs.
As for non steam and steam versions. Well if retail, BF copies and steam copies are all at 1.03 then they can play together.
it is the exe and database that stop people from 1.01 and 1.02 from playing with each other. I doubt that retail and steam versions will stop being able to play with each other because one has steam and the other doesn't. Non-sensical and SCS aren't stupid. Steam is just another way to get the game out and increase the customer base.
If you really want answers then ask Jamie directly. He will answer.
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