20000 to 20999 - Externally written plug-in messages

The messages between 20000 to 20999 are reserved for use by externally written plug-in messages.

To avoid confusion if multiple plug-ins choose the same error code, include some identification in the associated text loaded into the status array of the externally written plug-in. For example, prefix the error message with "Employee Plug-in:" or "My Plug-in:."