Infinity Engine Questions

Hi All,

I've been reading up about the different versions of the Infinity Engine that BG:EE, BG2:EE and IWD use and looking at SCS.

From what I can make out there are three main versions of IE (not including PST:EE):

One for BG1,
One for BG2
One for IWD

Out of these, the IWD is the most complete and the other games can be Modded/Updated to use the IWD engine. Is this correct? Can anyone that can shed some light on this?

Thanks a lot
Dave