Apache is listening on a different port, but how do I get it so I don't have to type in the port number? -

I am running IIS and Apache HTTP server side-by-side on my localhost machine, and Apache has a separate port (port).

81) Listening to IIS port 80. However, if I type in that port number, then I can only go to my virtual domain for Apache. For example:

How do I create it so that Apache automatically knows it is port 81, and does not force me to type into port number?

Edit:

The answer seems to be that I need to redirect IIS to Apache. Anyone provides explanations on how to do with IIS 5.1?

It's not a matter of saying Apache, it's a browser thing to connect to what you or So I'm going to redirect IIS to Apache, or leave it.