F. wrote:
> What is considered real-time? How much latency would be necessary for
> it to be no longer real-time?

The amount of latency doesn't matter. What is important is that the
latency does not exceed a given upper bound. For technical systems,
the latency usually is constant.

There is some info on wikipedia:

http://en.wikipedia.org/wiki/Real_time

Regards,
Andor