Can a website`s homepage have a CNAME to another domai

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Webado C Webada: You control your linking, don`t you? Otherwise I don`t understand the question, sorry.
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  Neil Cheesman: Thanks for the clarity
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  Randy Milanovic: Hmmm. I use CNAMEs to redirect, not mask. Setting error or am I overlooking something. Are either marketing/vanity domains?
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  Neil Cheesman: okay... website A has content on its homepage that is very similar to what is on the money aspect of the website - there is a link to buy products that goes through to a customized/branded `white label` as being part of website A. Some competitors use the white label (customized) as their homepage... and nothing else... BUT... on website A there is additional content on inner pages that is unique content and is useful to keep and to be linked to... ie.. news and reviews... but I am not sure if the CNAME is for domain level or url level..
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  Jim Munro: If you use the term CNAME, it`s a DNS question and DNS does not care about urls, only domains. A CNAME is a pointer to another subdomain or domain. When a url is requested, the CNAME replies: I am an alias of another domain/subdomain and here it is. The dns lookup continues to the domain/subdomain which is aliased until an A record (IP ADDRESS) is returned. On the other hand, googlebut cares only about urls, not domains/subdomains. googlebot treats subdomains the same as a domain because all domains are subdomains, even your_root_domain.com is a subdomain of its .com tld. You cannot have a CNAME applying to just a homepage. A CNAME aliases an entire domain/subdomain.
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  Jeremy L. Knauff: I don`t think so, but you could use .htaccess with regex to redirect only your homepage. I fail to see the benefit though. Focus your efforts on one URL and you`ll get more bang for your buck.