What is it?
BNC Connector is a piece of software. It simply allows to exchange messages between separate browser windows. All you need to use it is having this JavaScript library loaded on page and create connector instance.
The Concepts
There is a very few existing implementations that use cookies to communicate between browser pages. In fact, purely javascript solution arrives in two forms:
"Once upon a time at home ..."
Once upon a time at evening I have decided to properly brake the famous browsers communication problem and as a result you have landed in here. I have created implementation of BNC networks model with simple TCP/IP layer, that as transport packet it will use browser's cookie object.

BNCConnector currently supports:

I assume you have at least basic javascript knowledge in order to use this software. Example page with docs and demo page should be a "good enough" introduction.
Please use forum for comments and requesting extras.