The classes meet at assigned times. The students have a textbook. The teacher talks to the class and students can be 'given the floor' so they can also talk to the class. Some class material is shown to the class as web pages using a synchronized web browser. Other material is displayed on a whiteboard which functions as a blackboard in a traditional classroom.
Students can raise their hand to get the teachers attention.
Or, students can ask questions by using text chat. The teacher can have student answer a question by talking to the class or writing on the whiteboard. So, the virtual class is fully interactive. Students can also interact asynchronously with the teacher or their classmates by using email. Certified teachers are integral to the educational process.