A sequential file that is contained on more than one volume. The file either may contain more data than can be held on a single volume, or it may have been deliberately divided over multiple volumes.
If none of these phrases is specified, the CLOSE statement causes the current volume to be positioned at its beginning.
For sequential multivolume files, a CLOSE statement that does not include a REEL or UNIT phrase has no effect on any volume other than the current volume.