Retrieving launch arguments from URI?

I could really use some help.

Maybe I'm going about this the wrong way, but we're going to launch our application from a URI (don't know how exactly but I've seen it done). The URI should/needs to contain information/parameters for the app.

How do I, for Android, iOS and WP, retrieve the URI/intent/ and extract the arguments passed in?

iOS has the Main(string[] args) method, however args is always string[0] and NSDictionary options is always null, when launched from Visual Studio with iOS Run Options -> Parameters set to ID=1234