twisted中替代PB（Perspective broker，透明代理..

在查看zenoss的相关资源时，发现在Zenoss Enhancement Proposals中关于ZenAgent的话题中，提到了它们
1. AMP: twisted.protocols.amp,Asynchronous Messaging Protocol, 使用起来很方便简单。 To make a long story short, it's less powerful than PB, but a whole lot simpler. It has asynchronous messaging and argument marshalling between endpoints, but not arbitrary objects. I have found that this hits the sweet spot of more applications than PB (although PB is still better for communicating parallel simulations) [ed: and more security than that provided by XML-RPC]

2. FoolsCap：是将来PB的替代品，目前处于Alpha阶段。