This is incredibly difficult to do, it's probably possible and easier to do on 6.0 because the connection messages are all messed up. That being said I've found away to get 2 accounts hanging easily.
1. Have client A connect to a server like asiaSE
2. Move him to the guild hall portal
3. Press connect(or Play) on client B and immediately press enter on the guild hall on client A
4. If done right client A should be looping waiting to get into guild hall and client B is connected
*Note you can hit the O button for options and hit the button "back to home" to reset if you need to