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<name>.lck:    This is the file used by V2.0 of the Engine to handle all
   locks on the given table. You will normally not see this file because
   it gets deleted when the engine exits.

paradox.net: This is the file used by V2.0 of the Engine for directory
   access. This file will be created if one does not already exist.

paradox.lck:   Directory lock used by the engine 3.0 (Paradox 4.0) to
   keep out Engine 2.0 Applications, and Paradox versions lower than v4.0
   ( i.e. anything using Paradox 3.5 locking ). You will normally not see
   this file because it gets deleted when the engine exits.

pdoxusrs.lck:  This is the file used by V3.0 of the Engine to handle locks.
   You will normally not see this or any .lck file because it is deleted
   when the engine cleans up. See pages 29-34 of the Paradox Engine User's
   Guide for more information on 'Locking and Lock Files'.

pdoxusrs.net:  This is the file used in Paradox 4.0 style locking for user
   ID and use counts. Also used to co-ordinate locking. This file will be
   created if one does not already exist.