I see on T.V. URL's like www.dell.com/tv.  Is this a sub-domain or add-on domain or neither?

I would like to do a construct like this in FP 2000.  Will www.mydomain.com/xyz be the same as WWW.MYDOMAIN.COM/XYZ or is case not important?

Thanks in advance for any help on this.  

In your example, 'tv' is a subdirectory in the web folder, public_html. The domain is not case-sensitive, but the folders are.

Thus,  www.mydomain.com and WWW.MYDOMAIN.COM will work

but  www.mydomain.com/XYZ will not work if the folder is called 'xyz'

Here is a pretty good description of the difference between sub-domains and add-on domains:  http://webhosting.lilengine.com/web_hosting_pv/21/

You don't need either to publish a FrontPage web to a sub-directory.  All you need to do is create the sub-directory and tell FrontPage to publish to that directory.  You would access the site from a browser by typing

www.mydomain.com/xyz

(and if I understand TranzNDance www.mydomain.com/XYZ would not work if your folder was 'xyz').

You could get around that, I think, by creating a sub-domain, in cpanel, called 'xyz', (or any other name you wanted such as "goodstuff".  It doesn't have to be the same name as your directory).  You would access the sub-domain as follows:

www.goodstuff.mydomain.com

but now

WWW.GOODSTUFF.MYDOMAIN.COM

should work too.  As TranszNDance said, the domain name is not case sensitive, and you've already assigned it to the correct sub-directory ('xyz') when you created the sub-domain.

Hope that helps,
Ron

btw, when using subdomains, 'www.' is unnecessary. Thus, all you need is goodstuff.mydomain.com.

Using www defeats some of the benefits of a subdomain URL, such as conciseness and aesthetics.