I have seen this little nifty trick a number of times. No, it is not the hyper link, so don't tell me [url].
Here is an example of it: http://www.w3schools.com/html/tryit.asp?filename=tryhtml_basic
Please have the coding using ['s or ]'s, not <'s or >'s.
I'm really not sure what you're asking about here. Are you talking about the IMAGE LINK in the upper left corner? That's done by simply placing an image inside an anchor tag, like this:
<a href="http://www.w3schools.com"><img src="/images/w3default80.jpg" border="0" alt="W3Schools" /></a>
By the way, you can investigate the HTML of any page yourself by choosing View–>Source on your browser. Hope that helps.