> real time when used as a noun (e.g.: "in real time")
> real-time when used as an adjective
it should be `Real-time' and not `Real-Time' on the grounds
that capitalization nevers occurs within a hyphenated word
except for a proper noun.
Thus one would have RtSS and not RTSS.
(Likewise, `Fault-tolerance' and not `Fault-Tolerance' ...
which would reduce FTCS to FtCS).