A chat client Named Trillian is kinda gangsta, because it has what they call “Continuous Client” features in the latest beta build for Windows…See Details.
@TatWza

This Feature has thee ability to share chats between devices “in realtime,” allowing you to switch from PC to phone to iPad without losing the thread.
With this “presence technology” the client can make logical guesses about when you’re at (and not at) your PC or phone, and reroutes your notifications