Re: Big question here,

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That's probably not something you'd want to be doing without some verification, cookies in it self are not secure.
What you are trying to do is some sort of single sign on, there are two initiatives I know of on is microsofts passport, and a thel Libery Alliance project.

I don't think you can set a cookie on one domain and read it on the other. 

If you really need to do this, the easiest way would be to set up a single verifiaction server all your shops use. If you have any experience in PHP coding have a look at the XML-RPC section of the manual, there's plenty of documentation and a simple verification server is not that hard to set up.

HTH,
Rob