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 DrvNxtFreGet()
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 Purpose:
 Get the next unused network drive letter.

 Syntax:
 lpszDrive = DrvNxtFreGet()

 Parameters:
 None.

 Returns:
 A character string of length 1.

 Description:
 DrvNxtFreGet() returns the drive letter of the next unused drive on the
 network.

 Returns an empty string if an error occurs.

 Example:
 // To return the next available drive letter:
 lpszDriveLet = DrvNxtFreGet()
 if ( !empty( lpszDriveLet ) )
    ? "The next available drive letter is", lpszDriveLet
 endif

 Notes:
 This function only works with network drives.