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To take what chrishirst said even further -- you don't even have to have a link to the page that you don't want showing up in the SERP -- simply visiting the page can lead to its discovery by certain search engines. I know Alexa discovers, and subsequently indexes pages, through toolbar data, and I am mostly certain that Google does as well. I know that I've had googlebot hits to "hidden" pages, but I didn't really follow up with checking whether these pages were indexed or not.
If it's something that you really want hidden, you'll likely have to limit access by setting a cookie, enabling server-side authorization or using a session ID of some type.
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