I may not be following you, but let me try.
You are on a page.
You see a link on a page.
You put your mouse on that link.
If that is your question,
1) If you are using Internet Explorer as your browser, go to the View menu and click on Source.
the file of the page you were looking at will be on your screen. It is the code to make the page.
To see the external file, you need to go to your address window at the top of your browser and insert the file name after the domain name of the page you were first looking at.
I will use an example to explain.
The first page I am on is [bla.com....]
I want to understand how that link was made.
I go to the top of my browser in the "View" menu and click "Source"
The code of [bla.com...] is downloaded to my computer.
I look inside the <head></head> tags of that downloaded file and see this:
Does that answer your question?
If that doesn't answer your question, can you please post the URL of the page you are having trouble with?
I think we may need to have this information to help you.