sendScriptMessage

Hey yall, 

In the CS6 reference it states:

Scripting plug-ins

The CS6 JavaScript scripting interface allows for limited scripting for plug-ins. A plug-in can define a command, with an event and notifier, and a handler that performs some action. A JavaScript script can then use the app.sendScriptMessage() method to send parameters to that plug-in-defined command, and receive a plug-in-defined response.

For example, the Adobe Custom Workspace plug-in defines a command "Switch Workspace". A script can invoke this command with the following code:

result = app.sendScriptMessage("Adobe Custom Workspace" , "Switch Workspace", '<workspace="Essentials" >');

In this case, the value that the plug-in returns is the string "<error=errNo>".

Does anybody know where or how I can find out the native plug-in commands and what parameters they accept?

Thank you for any ideas!