Reserved Error Nums for "Raise Exception" Statement?

My 12/91, "Guide to SQL Reference" Manual, Page 8-67 on stored procedures says "The RAISE EXCEPTION statement is used to simulate an error. The generated error can be trapped by an ON EXCEPTION statement". This is great except that nowhere can I find a statement that tells me what error numbers Informix has reserved for my use. So what are they? Anyone at Informix have a clue? I have noted the 3/94 "Informix Error Messages Version 6.0" Manual Page IX which lists ranges of error messages used by the various Informix products. It doesn't really help me either. It needs two lines added to it: Error Message Range Error Message Category . +n / +m Reserved for Customer Use . -x / -y Reserved for Customer Use Ken Miles Vancouver Division Hewlett-Packard kenm@vcd.hp.com