There are two include files used by the Character Handling Routines to define global constants during
compilation. These files have the logical names SAE_PAR and CHR_ERR. The contents of each of
these include files are given below.
CHR_ERR
Defines the Character Handling Routine errors.
CHR__EOSNT – End of sentence.
CHR__WNOTF – Word not found.
SAE_PAR
Defines the global constants SAI__OK and SAI__ERROR.