ISA is an acronym for "Infinite State Automata." Lots of researchers believe that FSA (finite state automata) are a parallel for many complex biological systems, including intelligent systems, which I consider to have infinite possibilities, thus the title. Since this is a topic of scientific interest for me, it will always be incomplete in some way.
Mac OS X 10.3.9,
Mac OS X 10.4 PPC,
Mac OS X 10.4 Intel
||Mac OS X 10.3.9 or 10.4 (Universal Binary)