In this chapter, we will introduce three RITs: Ajax, Mozilla XUL, and Microsoft HTC. This chapter will give a high-level overview of these technologies, and it will show some simpleexamples to highlight the core feature of each technology. In later chapters, you will get intothe details of each technology to improve the user experience of two JSF components—ProInputDate and ProShowOneDeck. The following are the four main players in this chapter: Ajax 1 : Ajax is the new name of an already established technology suite—the DOM, JavaScript, and XMLHttpRequest. Ajax is used to create dynamic Web sites and toasynchronously communicate between the client and server. XUL: XML User Interface Language (XUL) which, pronounced zuul, was created by theMozilla organization (Mozilla.org) as an open source project in 1998. With XUL, developerscan build rich user interfaces that may be deployed either as “thin client” Web applica-tions, locally on a desktop or as Internet-enabled “thick client” desktop applications.