I was wondering if anyone definitively knew the rules/logic/rationale behind Apple's "Digit-Comma-Digit" model numbering system? For example, System Profiler lists my own Mac as Machine Model: PowerMac3,6 and (according to Wikipedia) all the Mac Pros released so far seem to use the numbers 1,1 through 5,1. I can understand the digits before the comma - they obviously signify a major release (or possibly a new/different processor from the predecessor's one?), but what of the digit after? If every Mac Pro is a "X,1", why bother with the ",1" at all? Also, why the comma rather than a full stop/period? I've only ever seen a comma used in place of a decimal point before in continental Europe for pricing things. For example, something might be marked "39,95" to indicate that it costs 39 Euros & 95 Cents. Why would Apple use the comma?