RE: House position and Last ten tradesYou don't have to pay. My 30 days expired and I'm still using it for house positions, but you can only make so many queries each day before it prompts you to register. The Market depth will cost you, but house positions remain free. I only use stockwatch for the newswire and 1 month house positions as my platform covers everything else a little better.
Weamins, to view house positions, enter a ticker symbol and when the stock info comes up just click on "Trade Workstation"