{
{   This procedure rewinds the permanent file utility backup file.  The backup
{ file must not be open when this procedure is called.  If the file is a  tape
{ file  which  has  not  previously  been  opened within current the job, this
{ request will cause the volume associated with the tape file to be mounted.
{
{       PUP$REWIND_BACKUP_FILE (BACKUP_FILE, STATUS)
{
{ BACKUP_FILE: (input) This parameter specifies the name of the backup file to
{       be rewound.
{
{ STATUS: (output) This parameter returns the request status.
{
{       CONDITIONS:
{
{       IDENTIFIER: puc$pf_utility_id
{
