It's a question a lot of us wish they would have. It's not open platform from what I can tell. Maybe there are some custom software apps that can link otehr brokerages to Tradestation.
Anyone know?
They do have a option where you can just use their software and then place your orders elsewere.
I wish they had a compatibility with REDI+, but then again they do not want to lose the money on their brokerage side.