ID is the message identifier.

Wparam is the WPARAM argument.

Lparam is the LPARAM argument.

Arguments can be written in decimal or hex. An example of hex notation is shown below.

The message is sent to the window that was targeted with TargetWin, SendWin, etc.

This command calls the system command with the same name. For more information, see Microsoft's documentation for SendMessage().

<hotkey F1>
   <sendpc local>
      <TargetWin Untitled>
      <SendMessage 0x7a3 29 0>

PostMessage
SendRegisteredMessage