Processing without labels is requested by means of:
the operand LABEL=NO of the FILE macro
the operand LABEL-TYPE=*NO of the ADD-FILE-LINK command
After it has detected the first tape mark, which initiated EOV processing, DMS checks whether a second tape mark follows and whether the volume list of the FILE macro or ADD-FILE-LINK command contains further volumes.
If there is no double tape mark on the tape, and if the volume list is not yet exhausted, DMS initiates a tape swap. It then checks the beginning of the new tape and then permits the user program to continue processing the file.
If DMS finds a double tape mark on the tape, or if no further tape is needed, DMS positions the tape after the last tape mark which was read and activates the end-of-file routine in the user program (using the EOFADDR exit of the EXLST macro).