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What is a cookie point rule?

I use Google Analytics and Google Website Optimizer together. On our development platform, I suddenly realized that some cookies were set twice.

GA Cookies:

__utma __umtb __utmc __utmz

where all are given both GWO and GA. I expected to see only one set of these cookies. GWO installed them with a dot in front of the domain name:

.dev.example.com

While GA sets them as:

dev.example.com

I tried to do this and read something about it in the RFC2109 HTTP State Management Mechanism

Looking for it here on SO, leads to a series of answers that refer to the “cookie point rule”, but I still don't understand.

What exactly is this rule and what consequences does it have?

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I understand that you understand the basics of how cookies work, namely that with any HTTP request, the browser will send all the “relevant” cookies that it has saved.

The cookie set for the domain "example.com" will only be relevant for requests from http://example.com , while the cookie for .example.com 'will also be relevant to all of its subdomains

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