Multipass surface shaders

I was struggling with getting multipass effect inside surface shaders. I know that there is this old topic on the forums but there wasn't clear answer to how do multipass. That's why a wrote this simple tip on writing those. You can check it out on my blog right here:
http://ethicalmotion.blogspot.com/2014/11/unity3d-quick-tip-multipass-surface.html

In this tip I am posting a sample code which allows you to create shader with separate qubemap reflection and specular and a multipass structure explanation. If you need more info about this topic just let me know.