K...yes, the PRO is an actual trading platform with direct access - I'm using the lesser platform of the two (web based java app) - but I'll say this there isn't a moment in the day that I wished for direct access because the simple trading desk feels so real - I can taste the fear even though it's steaming through their main feed - it's almost the real deal that's how direct it feels, in fact, when you buy or sell "at market" (if the liquidity is there) it happens instantaneously.
IMHO, don't concern yourself with PRO if all you're going to do is trade Canadian and US stocks - I'm setup with both US$ and C$ accounts, but no short account because I trade the bear funds instead.
FP........................................................