Architecture is a topic of growing importance, especially when considering the possibilities of running several Ajax/DHTML libraries in a single web application; in fact, client-side application architecture needs just as much consideration as server-side application architecture. Architectures can vary wildly, depending on the overall application design, but all need the flexibility to react dynamically to the actions of the user. A main advantage over traditional full-page load web applications, event-driven architecture flourishes in applications that maintain state. While the server-side application must rebuild its state on each hit, the client-side application can maintain an interface constantly for multiple actions, while still having the ability to rebuild the client-side state from server-side data whenever necessary.