Yhis is something useful mainly for multiplayer RTS games, but could be useful for any other game that needs to be able to execute a game in lock-step on multiple non-identical machines. To be fully deterministic in this sort of sense, the following would all have to be true:
RNGs are instantiated, called a consistent number of times in a "turn" (that might be 200ms), and give predictable output during that time period.
Floating point math, plus any other math, gives predictable results on all processors (AMD vs Intel, x86 vs x64, etc) and operating systems.
There is always a consistent number of simulation cycles per "turn," regardless of the number of frames drawn to the screen.
Basically, I'm wondering if it is possible to build a modern multiplayer RTS in Unity -- obviously single-player is no problem, and other networking models make multiplayer action/FPS/etc games quite possible in Unity, but I've not seen anything relating to simulation determinism in my investigation into Unity so far.