I am trying to peruse & understand some of the Script by placing the following.

Response.Write("<script>alert('SetShippingAddress()1...1')</script>");

I have placed this type of code in many place, but I do not get any indication that its is working. The code above does not stop the program excution.??

You should review some tutorials on the asp.net site (http://www.asp.net) to learn the basics before working with nopCommerce source.