If you meant implementing HipChat as an embedded chat functionality inside another application, I'm afraid that wouldn't be possible - that's something neither HipChat's API would provide.
On the other hand, HipChat does have its own Web client, if that helps.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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