The computer must have a sound card and speakers. That web page lists the courses available on the Internet. The format for most Internet courses is self-guided instruction. That means there is generally no set meeting times for the class. Materials for a particular course are included on the web page for that class and all correspondence with the instructor takes place through e-mail.
Some courses require that the students come to campus to take tests or give presentations.
The course instructor will determine if this is required.