Using the company name as a search term, is there an engine devoted to
providing just the "home page url" for that company, rather than all
the links in which the company name appears?

Alta Vista comes 'close' with their "URL:" qualifier.  But I'm looking
for a quick, simple way to determine IF any given company has a
website and what it's actual URL is.

A quick way to determine IF any given company has a website is to check out:
[Hoovers Online] accessible at: 
http://www.hoovers.com

I know this site because I have used it in the past.

Please let me know if you have any questions.
Thanks.
-googleexpert

Thanks.  I'm not familiar with Hoovers.  I'll check it out and see how
it works.  Appreciate the response.

try using "company name.com" google will find it

Try Google's "I'm Feeling Lucky" searching. It usually finds the official ws.

try http://www.dnb.com