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If you know when/where you want to send your updates you could simple create a node and send a MessageItem with a Point object in it.

If you want to stick with the ShareObject, because it manages all of that for you I think you should be able to pass a Point as the data to be shared instead of two Numbers for the coordinates.

In both case don't forget to do a RegisterClass(Point) in your initialization code so that the Point can be correctly serialized/deserialized.