Control Panel communicates with a Control Panel dynamic-link library (DLL) through messages it sends to the CPlApplet entry-point function. A message consists of three parts: a message number and two 32-bit parameters. Message numbers are identified by predefined message names. The two 32-bit parameters contain message-dependent values.
This chapter contains an alphabetic list of all messages that can be received by the CPlApplet entry-point function. To use these messages, you must include the CPL.H header file.