[Zope] multi zope communication

[David Pratt]

I am interested in two or more zopes talking to each other, 
particularly to lookup data and display results on the other or to send 
data from one to the other - so client and server.  Not simple 
syndication from one to the other but real two way communication. I am 
thinking of using XML RPC because I am not sure on whether SOAP can 
work properly on zope from basic material I have read thus far. What is 
most practical for production sites?  Anyone have experience using zope 
as a client and server in this way? I am also particularly interested 
in any recommendations for handling authentication and encryption in 
such a case.

Regards,
David