I just execute Browser by using ShellExecte()function.(Message Hook)

When 2 or more explorer Window are opened,
How can I handle it?

For example, there are 3 ie windows.
I just want to connect to "codeguru.com" with
second browser....(focus Browser)
What shell i do??
must use instance?? handle?? Process id??
Thread id?? or ShellExecuteEx()??