Yes. All of the above. Courses exist on the Internet today that offer interactive lessons -- some with teachers on duty and available to confer with the student online in almost real time.

Some courses on video are magnificent. Series have been made by PBS, Discovery Channel, The Learning Channel, and others that have curriculum plans, teachers guides, etc. They are complete in their approach to teaching unforgettable lessons. Some are single lessons and some are complete courses.

CD-ROM courses have been around for years now, and they are quite sophisticated. The quality of the lessons is sometimes better than that of some textbooks. The color and sound and action is attention-keeping and really drives the lessons home.

Of course, this high-tech stuff is not for everyone. Old-fashioned textbooks still work very well, too. But, YES, there are many active resources available for homeschoolers to use. They can use these resources at will, in a safe place, and in creative ways.