Before a media control driver (MCD) can interpret a string command, the media device manager (MDM) must use a command table to change the string into an equivalent procedural command. Represented as resources to the driver, command tables are created using the RCDATA type of resource. The resource number of the RCDATA block is the device type number. The \TOOLKIT\SAMPLES\MM\MCDTBL subdirectory contains command tables for each of the following devices:

• Amp Mixer
  
• CD-ROM/XA
  
• CD Audio
  
• Digital Video
  
• Sequencer
  
• Videodisc
  
• Wave Audio

If you want to support device-specific messages, you must create a device- specific command table.