Gets the URL of the resource that is currently displayed.
the URL. The caller frees this buffer with SysFreeString.
If the resource is a folder or file on the network or local computer, the name is the full path of the folder or file in the Universal Naming Convention (UNC) format.
If this method is called before the first navigation is complete, InternetExplorer returns an empty string and S_FALSE.
Build date: 11/17/2013