If it were that easy, it would have been done already. Mark explained why that wouldn't work in all cases in the last EntityExists( ) thread.
Uh huh. What kind of EntityExists are you referring to here? I'm talking about the kind that tells you whether or not an entity occupies the memory address you provide it, not the kind that magically knows what entity that should be there.
Edit: And just to note, the kind I'm talking about I currently have implemented in my own engine, and it does what I want it to: tells me that an entity is occupying a particular space.