NAME
	CxMsgID -- obtain the ID of a commodity message. (V36)

   SYNOPSIS
	id = CxMsgID(cxm);
	D0	     A0

	LONG CxMsgID(struct CxMsg *);

   FUNCTION
	This function returns the value associated with the cause or source
	of the commodity message 'cxm'. Values are provided by the application
	when a sender or custom object is created.

   INPUTS
	cxm - the commodity message to inquire about (must NOT be NULL)

   RESULTS
	id - if not specified by the application, the ID value of a
	     commodity message will be 0. It is suggested that using
	     non-zero values in your program as a rule may identify some
	     possible errors.

   SEE ALSO
	cx_lib/CxSender(), cx_lib/CxCustom()