B: tp.mnt( unit, volume )
C: #equate tp_mnt tp.mnt void tp_mnt(FILE *unit, int volume);
TP.MNT is used when processing a sequence of related input tapes. It asks the operator to mount a new tape to replace the one currently mounted. If an alternate tape drive is assigned to the associated file code, a swap to the other drive will also be made. Once TP.MNT has returned, further reads from "unit" will be from the new tape.
TP.MNT is not used to get the continuation reel of a labelled multi-volume set since the B library does this automatically.
GCOS gives the operator the option of aborting the job.
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