If you want to force your user to use your application within in an iFrame (either as a canvas app or as a fan page application), the only way to do so is using JavaScript. Here is some sample code you can use.
Facebook, JavaScript, TutorialEver wondered what a Facebook App requesting every possible permission would look like?
Application, Facebook
I created a second Facebook app for the Financial Times that scrapes a number of RSS feeds to bring in editorial content into Facebook. The app uses XML for flat-file storage and caching to speed up loading.
Tagging app releases in SVN to preserve the code and history.
