Category is special word in ASP.NET MVC2? So how can I use something else?

I have just realized that, by chance, I implemented a category browse type situation in my project:

// GET: /Category/Brows开发者_Python百科e?Category=Fruit
public ActionResult Browse(string category)
{
    ...
}

It turns out this is special case and there must be something behind the scenes. My next one I want to implement something like

//GET: /Category/Browse?Color=Blue
public ActionResult Browse(string color)
{
   ...
}

You get the idea...

Where/how do I register the different url values?

---

You don't need to register anything. Action parameters are automatically mapped to URL values by the default model binder. You can also map to complex type, list and dictionary parameters.