You simply have to publish AA BB and CC to different items and then let each client subscribe only to the items it is interestred in.

As an example you can see this demo http://demos.lightstreamer.com/StockListDemo/ subscribes to items 1 to 15, while this one http://demos.lightstreamer.com/jqGridDemo/ subscribes to item 1 to 10. Obviously any combination is possible

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