The discussion board allows you to communicate with the other students on your team, raise a red flag when there is a problem that needs faculty attention and selectively loop in your client or project sponsor.
You can create new threads, respond to existing threads and attach files to your message. When creating a new thread, selecting "enable client discussion" allows your thread to be read and responded to by your client/project sponsor. The thread cannot be unshared with the client so be sure to pay attention to the content of your message!
Selecting alert faculty when creating a new thread sends an email notification to your faculty or program director prompting them to review your message. This is used to get their attention when you are having an issue with your project (for example, client is unresponsive).