* 푸시 서버  http://m.mkexdev.net/71   * C2DM  http://arabiannight.tistory.com/111   * XMPP (프로토콜) 개요1  http://www.ibm.com/developerworks/kr/library/x-xmppintro/index.html  http://www.xmpp.co.kr/?q=node/62  http://neosum.tistory.com/category/Project/XMPP   * XMPP를 이용한 Google Push Service  http://blog.softwaregeeks.org/archives/581   * JABBER 프로토콜  http://atomkwang.tistory.com/entry/%EA%B5%AC%EA%B8%80-Talk-%EC%97%90%EC%84%9C-%EC%82%AC%EC%9A%A9%ED%95%98%EB%8A%94-%EC%9E%AC%EB%B2%84Jabber-%ED%94%84%EB%A1%9C%ED%86%A0%EC%BD%9C   
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