Routine Name:	addmsgdef

Description:	Adds a new message type allowing messages of that type
		to be added to the element.

Usage:		addmsgdef element message-name [message-arguments...]
		 -type message-type

		element		element for which to add the message
				definition
	
		message-name	name of the message (the convention is
				to use all upper case)

		messages-arguments
				zero or more names for the data slots
				of the message

		-type		option to set the message type number
				explicitly
				
Notes:		It is normally unnecessary use the -type option as
		addmsgdef assigns an unused message type number
		automatically. -type should be necessary only for
		specifying active messages.

See also:	deletemsgdef, showobject, Extended
