What are the different categories of messages?

• Administrative (e.g. app (dis)connected)
• Image Operations (e.g. loadImage)
• Table Operations (e.g. loadTable)
• Procedure calls
• Status/Info
• Get/Set methods
• Events

From the point of view of the specification, I'd say there's administrative methods (exchanged between a client and the hub/messaging fabric), and application methods (exchanged between one client and another). I don't see why, for the purposes of the messaging spec, they need to be categorized further -- NoelWinstanley