Twisted in Zope3?

Is it true that Twisted is part of Zope 3?

"Other changes in Zope 3: it uses an XML file (.zcml) for 
configuration, and it uses Twisted for its network layer, although it 
doesn't use Twisted's HTTP server."  (from 
http://www.linuxjournal.com//article.php?sid=6800 )

Could someone point me to an architecture document (or somesuch) which 
confirms this, goes into more detail?

If so, that sounds great.  This architectural feature would be well 
worth advertising (IMO).  It's nice to see Zope adopt and dovetail with 
another powerful framework.

Thanks,

= Joe =