Lyris runs on your computer. You, as the administrator, create mailing lists with Lyris, and Lyris takes care of all the details of making it work. When a new message is contributed, each member of the discussion receives the message in the manner that they specified.
Some people receive every message immediately, in their email.
Still others elect not to receive any email, and prefer to read the messages on the Web using the Lyris Web Interface. This could be just you, a number of people in your organization, or specific people you choose. Lyris will also do this for you.