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  Multi-Record Locking:

  If you have ever wished you could lock an entire group of records to
  perform some action on the data, you can now do it!  The SIx Driver
  allows you to lock and unlock groups of records with its Sx_RLock() and
  Sx_UnLock() functions.  These both take an array of record numbers as
  a parameter and return an array of corresponding logical values indicating
  the success or failure of each record's lock.

  You can also check on the locked/unlocked status of a single record with
  the Sx_IsLocked() function, or on a group of records with the Sx_GetLocks()
  function.