Nonstandard labels and tape files without labels

BS2000 also permits the processing of tapes and tape files which do not contain standard labels. This is also controlled by the FILE and FCB macros (LABEL operand) and by the ADD-FILE-LINK command (LABEL-TYPE operand). The specifications LABEL=NO and LABEL-TYPE=*NO mean that the file to be processed has no labels, while LABEL=NSTD and LABEL-TYPE=*NON-STD mean that the file has labels, but these are not standard labels. Such nonstandard labels must be written and evaluated by special EXLST routines in the user program; the user may define labels of any format and type.