[An article about Service Workers](https://www.packtpub.com/books/content/introduction-service-workers?utm_source=Sentori&utm_medium=Email&utm_campaign=Data+Dispatch+-+Mid+June+15)

> Just like Shared Workers, a Service Worker runs in the background, but it can even run when your website is not actually open.

Daemons via http?  Interesting.

Looks like requests are [locked down to the origin](http://www.w3.org/TR/service-workers/#security-considerations) (mostly... "importScripts()" & maybe CORS?).  But other than that could be good for background update/notification checks, etc.