BIS is a public version of BES, which is hosted by RIM. BIS access is restricted to BB Alliance members.
Your choices are:
BES (if the phone is connected via BES)
BIS (if you are an alliance member)
Not all options are available on all phones. I suggest that you download the development environment and go through all of the samples and developer videos.
Some links: Livelink - Redirection BlackBerry - Java Application Development