Detect external event move on server.

Hiya,

I am looking to detect whether or not the event being moved is from an external source. This is available for client-side JavaScript but seemingly not for the server OnEventMove event.

I only ask because referencing an index ofe.Tag for an externally moved event results in disaster, and I'm not a big fan of handling null reference exceptions on what are essentially dictionary based collections.

Thanks for any help,
Ben