This functionality isn't built into HipChat, however you may be able to do programmatically using our HipChat API v2: https://www.hipchat.com/docs/apiv2 (available for both HipChat Cloud and Server) by invoking the Send Message method: https://www.hipchat.com/docs/apiv2/method/send_message
Be sure you understand that if you send a message this way, the 'from' entity will be whomever generated the v2 token. If this is a problem, you can use the Send Room Notification method: https://www.hipchat.com/docs/apiv2/method/send_room_notification instead which allows you to dictate the 'from' user.
Hope this helps!
HipChat Server Support Engineer | Atlassian
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