You can open Google Hangouts in Gmail to chat with others, but you will need to send an invite if the contact is not yet on Hangouts.
People can join a Google Hangouts session via Gmail, the Hangouts mobile app, the Hangouts site directly, and with a Chrome extension.
To let you get more done in one screen, Google Chat on the web is getting a split pane UI. The Home page today lists all your conversations in an edge-to-edge view with a click opening the space, ...
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