Explanation for CICS abend codes with no manual

CMAC is a transaction which gives online access to information that is contained in the CICS Messages And Codes manual. It may be accessed by typing one of the following from a clear screen in any CICS test region: 

CMAC (then fill in the blanks on the screen) 

CMAC abcd (where 'abcd' is the abend code) 

CMAC xxxx (where 'xxxx' is the message number only) 

CMAC yyxxxx (where 'yy' is the component id and 'xxxx' is the message number) 

CMAC DFHxxxx (where 'xxxx' is the message number) 

CMAC DFHyyxxxx (where 'yy' is the component id and 'xxxx' is the message number)