在CRM的呼叫中心里，每隔1秒会有一个poll:
the browser polls at regular intervals (typically once per second) to the server and will thus get the information that the new event (alerting phone call) has occurred.
Hybris backoffice
打开backoffice, 什么都不干，每隔一段时间有一个roundtrip到java端：
response:
发起这些zkau轮询的js文件cockpitNGAdapter.js在temp folder下面:
这些request的purpose:
http://forum.zkoss.org/question/109480/continuous-requests-for-zkau/
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