OneDbf:NtxOpen(lContinue): public: return true/false
  The index files of opened database file are opened (as by the command
  NET SET INDEX). When succesfull returns true.

  Parameters descripton:
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  lContinue: logical: default is true
   If true, it can be continuing the program even if the files couldn't be
   opened. This must be confirmed by the user.
   This problem may arise in the network environment.