Does Fire support multiple accounts being connected to the same service at the same time?
No. At this time Fire only supports you being connected to a service with one account at a time. This means that if you are connected with one account for a service (like AIM), and you ask to have another AIM account connect, the first AIM account will be disconnected, and the second AIM account will then be connected. This may change in the future, as support for multiple connected accounts is a common feature request we receive.