The following slide presentations were created using the Microsoft Power Point program, which is a part of Microsoft Office. You can view each of them using that program.
If you do not have, or cannot afford, Microsoft Office, there is an alternative. A free, open source suite called LibreOffice is available for Microsoft Windows, OS X and GNU/Linux. It supports all Microsoft document formats, including the Power Point format.
We owe many thanks to Dave Franck for creating and providing these slide shows to us.