Continuing from my blog yesterday: one compelling feature of Seaside is the interactive nature of web development and debugging. By opening a halo in a running web application you have access to developer tools: yes, right in your web browser you can see the code that is executing in the current context, change and save it, etc. In a Smalltalk programming environment (like a good Lisp system), you can modify/fix code on the fly – Seaside provides this development functionality for web applications.