{
{   The purpose  of  this procedure is to skip to the next backup file logical
{ partition.  This routine can be called independent of what device the backup
{ file  resides  on.   If  the  skip  encounters  end  of information the file
{ position of puc$eoi will be returned.
{
{       PUP$SKIP_LOGICAL_PARTITION (BACKUP_FILE_ID, FILE_POSITION, STATUS)
{
{ BACKUP_FILE_ID: (input, output) This parameter specifies the  identification
{       of the backup file.
{
{ FILE_POSITION: (output) This parameter returns the file position as a result
{       of the skip.  In general  this  is  either  puc$partition_boundary  or
{       puc$eoi.
{
{ STATUS: (output) This parameter returns the request status.
{
{       CONDITIONS:
{
{       IDENTIFIER: puc$pf_utility_id
{
