Videostreams require QuickTime 6.0 or above. This FREE video player is available from http://www.apple.com/quicktime/download/standalone.html
Audio / Video files are available in mpeg3 (mp3) or mpeg4 (mp4) format. The QuickTime player will read these files.
Lesson plans, transcripts, and other text files are available in PDF format, requiring Adobe Acrobat Reader software available from http://www.adobe.com/products/acrobat/readstep2.html
Compressed archive files of lessons and videos are available as ZIP files. ZIP files may be uncompressed with such free programs as WinZip for Windows or StuffIt for Macintosh.