In VB6, there is the "Shell" command to start an application. I do not know its details. Maybe you have to use the full command line to it, e.g.
Shell("""C:\Program Files (x86)\Internet Explorer\iexplore.exe"" http://www.google.com/", vbNormal)
maybe the URL alone could do:
Shell("http://www.google.com/", vbNormal)
Just try it.