er, though perhaps not at the same speed. A typical example
would be emulation of one computer by (a program running on) another. You might use an emulation as a replacement for a
system whereas you would use a simulation if you just wanted to analyse it and make predictions about it. [Computer and
Information Sciences] 
n., Emulation should be more than simulation. This should mimic exactly the behaviour of the circumstances that it is emulating.
[Computer and Information Sciences] 
n., The exact execution