How can I implement the pop out functionality of chat windows in GMail?

Question

I\'m not looking for a full implementation, I\'m more interested in how they do it. I know they use GWT, but I\'d like a more low level answer. Naively, I would start by think

Answer 1

I would say the easiest way would be to have the data stored on the server (which you probably do already), then just have the new window retrieve that data.

Of course that wouldn't persist things like contents of a text-box the user has input, so depending on what the window is for, it may be impractical.. but it's always best to start trying the simplest option!