All communications go through parent-company Research in Motion's servers as you continue to exchange messages.
With BlackBerry Messenger, however, the server stays involved as it would if you were sending e-mails. After that, the server is no longer involved, and all communication is between your client and that of your message recipient. Then the server determines which contacts are logged on and sends that information to your client, as well as letting the contacts know you're available. The server creates a temporary file with connection information for you and your contacts. Once you've logged on, the client sends the server your connection information (IP address), your computer port number and the names of everyone on your contact list. That client connects to the provider's server, using a proprietary protocol for communication.
With most instant messaging services, you download software that becomes the client on your computer or smartphone. Introduced in early 2006 as a feature of BlackBerry Enterprise Server 4.1, BlackBerry Messenger isn't compatible with popular IMing programs. However, the biggest disadvantage of BlackBerry Messenger may be that it only allows you to exchange instant messages with other BlackBerry users. One disadvantage of BlackBerry Messenger is that you can't send an instant message to someone unless you know his or her PIN code, the eight-digit letter-and-number code assigned to that particular Blackberry device.
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