The NDF_ routines adhere throughout to the standard error-handling
strategy described in SUN/104. Most of the
routines therefore carry an integer inherited
status argument called STATUS and will
return without action unless this is set to the value
SAI__OK when they are invoked. When necessary, error
reports are made through the ERR_ routines in the manner described in
SUN/104. Where exceptions to this general behaviour exist, they are
noted in the appropriate subroutine descriptions in
Appendix
.