I really don't see the difference. We have always had CAP keys on 'NEC key telephone' days(CAP came from call appearance as apposed to CAR call arrival) hence the abbreviation.

I do agree that there is a problem with held internal calls (they show on a CONF key which they removed from the DT300/700 handsets (you think NEC could have moved this to the feature key)

This is why you need an ICM key (also for the crap 'red pheonix' desktop suite)

but in saying this not many users put internal calls on hold (wouldn't you just ring them back?)

(this is how it works on AUS version anyway)