The server code is written in JavaScript, a nice touch that allows some harmony with the client-side code mixed into the application. Everything is hosted automatically by AppJet in their server cloud. One of the neater features is a button that allows you to clone many applications. It's a nice mechanism for encouraging people to build on the work of others.

The best part, though, may be the practically prehistoric requirement that all of the code should be bundled in one file. The CSS, HTML, and JavaScript are all stored in one file and edited in one window on the left of the browser. A test version of the application appears in the right. It's a style that goes way back to the days of paper tape and BASIC programs. The only thing missing is line numbers.

The irony goes even deeper, because AppJet's framework and simplicity mean you're building an entire Web site out of a simple file. It's a funny conceit that probably can't outlast the ability of humans to make things more complicated than they need to be. But it illustrates just how much can be done with these simple applications.