The following components are mentioned because the IR commands are specific to these models.  If the components are substituted with anything else, the programming must change to match.

A/V Components List

Audio

• Yamaha RX-V592 Natural Sound AV Receiver
• Sony CDP-CS300 300 Disk CD Changer
• Technics SH AC500D Digital Surround Processor

Video

• Toshiba SD3107 DVD Player
• JVC HR-VP676U 4 Head HQ HI-FI VCR
• Hitachi Ultravision 50" Projection TV

There are other components but they are not controlled by Mary and won't be mentioned here.  The distribution of control can be seen here.