usMsg (USHORT) - input

This is one of the following commands you want to send to the captioning window.

CC_START (1)

Use this command to start captioning. "Start captioning" means to display the window that was created in the ccInitialize command, and to begin scrolling the appropriate text file in synch with an audio file. Set mp2 to point to a CC_START_PARMS structure.
CC_STOP (2)
Use this command to stop captioning. This command hides the caption window. Set mp1 and mp2 to zero.
CC_SET (3)

Use this command to set the status of the captioning system. The same items that can be queried can also be set. mp2 should point to a CC_SET_PARMS structure. Note that these items can be queried and set even while captioning is going on.

CC_STATUS (4)
Use this command to query the status of the captioning system. Status items you can query and set include:

• Number of text columns
  
• Number of text rows
  
• Text color
  
• Background color
  
• Caption window X and Y coordinates
mp2 should point to a CC_STATUS_PARMS structure.

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