EcturE> WhEn onE systEm pErforms in Exactly thE samE way as anothEr, though pErhaps not at thE samE spEEd. A typical ExamplE would bEEmulation 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. (2003-05-22)
