Using a process instance again

I've started an IE process like this:

Process.Start("iexplore.exe","http://www.google.com");

Is it possible to grab the handle for this process and use it again like this:

Process currentProcess =Process.Start("iexplore.exe","http://www.google.com");
currentProcess.StartInfo.FileName="http://www.microsoft.com";
currentProcess.Start();

This piece of code produces a "The system cannot find the file specified" exception, but is it possible to change the current IE page process to another URL programmatically?

Thanks in advance for any tips