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From the content: To enable this, Google Talk uses the standard XMPP protocol for authentication, presence, and messaging. ... but don't miss the heading

by esses 8y ago

From the content: To enable this, Google Talk uses the standard XMPP protocol for authentication, presence, and messaging. ... but don't miss the heading We announced a new communications product, Hangouts, in May 2013. Hangouts will replace Google Talk and does not support XMPP.