Yes you can. You can do that by building a HipChat Connect add-on. All detailed in https://developer.atlassian.com/hipchat/getting-started. For your add-on to access the entire group, you'll need to request the view_group and view_room scope (more on scopes here: https://developer.atlassian.com/hipchat/guide/hipchat-rest-api/api-scopes) and set the "allowGlobal" property on the descriptor to "true" (more here: https://www.hipchat.com/docs/apiv2/capabilities).
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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