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Locks may be at the record and at the file level.  Paradox (though not the
engine) can also set family locks.  NOTE that locks are applicable only when
the Engine is initialized with PXNetInit or PXWinInit.

   FL  -  full lock. An exclusive lock.  Prevents other users from reading
          or writing the locked object.

   WL  -  Write lock. Prevents other users from writing the locked object.

   PWL -  Prevent write lock.  More a state than a lock.  Prevents other
          users from placing write locks.

   PFL -  Like PWL except that it prevents other users from placing full
          locks.

Also,  the following Engine functions place automatic (implicit)
table locks:

  PXTblAdd    -  WL on source; PWL on destination
  PXTblCopy   -  WL on source; FL on destination
  PXTblCreate -  FL
  PXTblDelete -  FL
  PXTblEmpty  -  FL
  PXTblOpen   -  PFL
  PXTblRename -  FL on source and destination
  PXKeyAdd    -  FL
  PXKeyDrop   -  FL

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