Comet

什么是Comet： 

http://baike.baidu.com/view/577938.htm?fr=ala0_1

Comet介绍： 
http://www.ibm.com/developerworks/cn/web/wa-lo-comet/

Comet&Java实战： 
http://www.ibm.com/developerworks/cn/web/wa-lo-w2fpak-comet/index.html

Comet Wiki： 
http://en.wikipedia.org/wiki/Comet_%28programming%29

开源Comet框架Pushlets： 
http://www.pushlets.com/

htmlfile实例： 
http://blog.csdn.net/tzsmin/archive/2008/10/28/3165071.aspx