Attempt to FLOCK() with optional retries
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 Syntax

        GT_FilLock( nSeconds )

 Arguments:

      nSeconds - Number of retries - 0 to retry indefinately

 Returns:

      .T. if the file was locked
      .F. if the file was not locked

 Description:

      Attempts to FLOCK the current area.  If it fails, waits for a second
      and tries again.  After nSeconds retries it fails.

 Examples:



 Source: FILELOCK.PRG

 Author:  Martin Colloby