If you are talking about a one-shot, live situation, there are plenty out there like GoToMeeting.com

If you want to create an instruction system that can be viewed and used 365-24, there are tons of corporate training systems that allow you to fill their ready structures with your own content. HR departments use these for training massive numbers of employees on Sexual Harrasement laws, rules and codes of conduct. They use the same systems for all types of remote-employee corporate training. These are typically IP-only.
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When the phone don't ring, I'll know its you.

The Aftermath Video

My Absolute Hero!