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 VolDirFreGet()
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 Purpose:
 Get available directory entries on a volume.

 Syntax:
 dwDirFree = VolDirFreGet( iVolNum )

 Parameters:
 iVolNum The volume number - 0 for the first volume, 1 for the second etc.

 Returns:
 A numeric value (unsigned long int).

 Description:
 VolDirFreGet() returns the number of unused directory entries on the
 specified volume. This value changes as files are created and deleted.

 Returns NOVERRLONG if an error occurs.

 Example:
 // To display the number of unused directory entries on the
 // first disk volume.
 dwUnused = VolDirFreGet(0)
 if ( dwUnused != NOVERRLONG )
    ? "There are", dwUnused, "unused directory entries on volume 0"
 endif

 Notes:
 The value returned by this function will fluctuate significantly
 because NetWare allocates directory entries dynamically.