All resources are delivered via the Internet. I used to rely on a physical textbook, but the range of materials are now rich enough that it is possible to rely solely on virtual materials. The web board also has a live chat feature. A Web site holds a collection of my lectures, extensively re-worked for hypermedia format. The Web also holds other resources, such as assigned readings from original sources, collections of pictures, study questions for exams, questions and topics for class discussion, and a library of links to other net-based resources.
Students check the Web site when starting a new study unit.
They read the lectures and assigned readings, and check the discussion questions. They might reply to some message, or they might have new comments or they might have new comments or questions to offer. By the third week of class, the dialog here is pretty much continual. It's the same or a bit heavier, but not too much. That's the general consensus of students over many semesters.