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Oooops...sorry I forgot to mention how this is related to Lightstreamer :p

If your Push-pages live inside a frameset, so that Page A is a Push-page that creates the engine with the createEngine...

Opera has a strict security behavior dealing with cross-frame scripting through a frameset.

Even if some browsers has "not-so-strict" rules, we can say that a way to make "cross-frame scripting"...