This week's book giveaway is in the Performance forum. We're giving away four copies of The Java Performance Companion and have Charlie Hunt, Monica Beckwith, Poonam Parhar, & Bengt Rutisson on-line! See this thread for details.
Can't be done. A single request can return only one response. There is no way to split the response up to separate windows, or to split the request into multiple responses. You'll need a separate request/response per window.