Analyzing Games Online

A friend and I would like to be able to review each others' OTB tournament games online (we live in different cities) and want to know the best way to do so. Right now here is what we do:

1) Whoever plays the game puts it in his database and runs it through an engine to look for mistakes/blunders

2) We set up an unrated game here on chess.com. 

3) For each move, we discuss what we think is the best option for the player, without looking at the next move or the engine analysis. (obviously one of us will already know some of the moves)

What we would love to have is an engine running that both of us can see in the same window as the board we are playing on. Does anyone know how to do this on chess.com or any other site?

That nice i want online games