Thanks for the info. I will change to the new API.

Could you explain the difference between PushPage and Engine interms of error handling ? More specificly, do I need to add onClientAlert ( e.g ) on both PushPage and Engine? What are the scenarios when either of them is called ?

PS: I am already become a big fan of Lightstreamer! I couldn't find any page that tells me the pricing of the advanced version.