docs: public boolean unlockThisRecord(Task objSession, String strDatabaseName, String strRecordName, Object bookmark)
          throws DBException
      {
          SessionInfo sessionInfo = this.getLockSessionInfo(objSession, null);
          try {
              boolean bSuccess = this.getRemoteLockSession(sessionInfo).unlockThisRecord(strDatabaseName, strRecordName, bookmark, sessionInfo);
  //?            if (bookmark == null)
  //?                this.removeLockSessionInfo(objSession);    // For close all, remove the session
              return bSuccess;
          } catch (RemoteException ex)   {
              throw DatabaseException.toDatabaseException(ex);
          }
      }