Where is the "Home" url defined?

I'm sorry this sems to be such a basic thing but I just can't find it anywhere.
In my header are the links: "Home", "Log In", "Shopping Cart", "Checkout", etc. All the links, when moused over, show a correct url except for "Home" which just shows the root folder but not the specific file to open.
Where is the url defined?
Many thanks!

You shouldn't need a specific page. Browsers will look for index.html or index.php automatically.

yoursite/index.php

If you are trying to place a link within a template file

afo:

You shouldn't need a specific page. Browsers will look for index.html or index.php automatically.

I guess it only finds it if it's in the site root folder rather than the shopping cart root. I guess I can live without the "home" link. Thanks for checking this out, I appreciate it!

It should work even if it's not in the root. If the "home" address is http://www.mydomain.com/store, browsers should look in /store for index.php or index.html. I've got Zen Cart installed in separate folders as test sites to keep from playing with the live sites.