In this session, David Temkin of Laszlo Systems will describe OpenLaszlo's transition from a Flash-specific development platform to one that provides a choice between Flash or Ajax. Temkin will demo and describe the workings of OpenLaszlo 4.0, which allows developers to create DHTML or Flash from a single source code base. The presenter will discuss the the pros and cons of each runtime environment, and the challenges of bridging the two with a single XML language and framework.