Lightstreamer is a Java-based push engone used to deliver real-time events to any clients over HTTP. It is especially used in conjunction with AJAX clients to implement the "Comet" paradigm. Version 3.4.5 of Lightstreamer Server has been released. An update to the Web Client libraries is available too. Web Client v.4.2.1 implements a new feature, called "automatic engine migration". When a Master Push-Page is lost (closed by the user or replaced by another page), all the remaining Push-Pages that are part of the same application will elect a new Master Push-Page, and the LightstreamerEngine object will migrate to the new Master. All this process is automatic and is enabled through the "SHARE_SESSION" flag in the createEngine() function. For more information and to download the software: