[Wolves] How does push email work?

[Alex Willmer]

2009/3/17 Jon Farmer <jonfarmer at enta.net>:
>> I can't find the right keywords to get past the marketing material.
>
> http://en.wikipedia.org/wiki/Push-IMAP

I've read that thanks, but I thought the point of push email was that
the phone doesn't need to poll the mail server or maintain a long
running TCP/IP connection. Hence it's battery lasts much longer. How
does Push-IMAP keep the connection open, without draining the battery?
What implements the heartbeat?
-- 
Alex Willmer <alex at moreati.org.uk>
http://moreati.org.uk/blog