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	CxFilter -- create a commodity filter object. (V36)

	filterObj = CxFilter(description);
	CxObj *CxFilter(STRPTR)

	Creates an input event filter object that matches the
	'description' string. If 'description' is NULL, the filter will not
	match any messages.
	A filter may be modified by the functions SetFilter(), using
	a description string, and SetFilterIX(), which takes a
	binary Input Expression as a parameter.
	This function is a C-language macro for CreateCxObj(), defined
	in <libraries/commodities.h>.

	description - the description string in the same format as strings
		      expected by commodities.library/SetFilter()

	filterObj - a pointer to the filter object, or NULL if there
		    was not enough memory. If there is a problem in the
		    description string, the internal error code of the filter
		    object will be set to so indicate. This error code may be
		    interrogated using the function CxObjError().