XPLMSendMessageToPlugin

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XPLM_API void       XPLMSendMessageToPlugin(
                         XPLMPluginID         inPlugin,
                         int                  inMessage,
                         void *               inParam);

This function sends a message to another plug-in or X-Plane. Pass XPLM_NO_PLUGIN_ID to broadcast to all plug-ins. Only enabled plug-ins with a message receive function receive the message.