John,
Yes, you can. The easiest way to do this would be to send the URL to
the static Start method on the Process class. This will open the default
web browser for your machine. However, if you must use IE (say another
browser is set up as the default), then you can send a command line of
"iexplore.exe <url>" where <url> is the url of the site, and it should open
to that site.
Hope this helps.