HTML and server side scripts like PHP and ASP.NET are using the URL to send parameters to other webpages. You can use the <form> tag to do this. HTML is using the URL if the method is set to GET ( It also can be set to POST but, the then it will be encrypted and not using the URL to send the parameter.)
This will send the input field content in form of : ?user=What ever you typed in.
<form name="input" action="html_form_action.asp" method="get">
Username: <input type="text" name="user" />
<input type="submit" value="Submit" />
You can also add a parameter directly to an href in a link attribute URL to send it: This looks like this:
I hope this helped, because I didn't understand what you meant with tracking. In this way you can link to a complete selected content or, for instance a Google search result.
<a href='nextpage.php?del="true" >your text </a>