Read the URL of the Browser

Question

hi friends,
I am trying to create a win application. Which will run in the background(System Tray).
I enter 2 parameters, 1.url(www.google.com) 2.value(1)
If the user opens the browser with url www.google.com?value=1 Then the application should give Pop-up message indicating this url has been opened with its link.

My problem is how to Check if browser is opened and if opened, has this url been opened? Any suggestions to this topic will be highly appreciated.