iPhone/iPad. How do I launch an app from link in Safari?

I have an app that I want to be launchable either explicitly when tapped or when a parameterized URL is clicked on on a webpage in Safari running on iPad or iPhone.

Can someone sketch the approach for me and/or point me to the relevant docs? Thanks so much.

Cheers,
Doug

From stackoverflow

• Launching Your Own Application via a Custom URL Scheme

  dugla : Whoa. Very Cool. The code almost writes itself ;-). Cheers.