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   The function of a data entry object is to create, modify and delete data
   in the file on which the object is to operate. The interaction with the
   master file (the one associated to the object) is implicit in the
   definition of the object itself.

   During the update operations on the master file (thus writing any changes
   to disk), dBsee allows to access other files for eventual Replace and
   Append operations. These operations are called, in dBsee,
   Transactions.

   Transactions are a group of update operations made by the object on files
   different from the master file. A transaction is useful when the
   modifications made on the data contained in one file must be carried into
   other files of the database.

   Two types of transactions exist:

   1.  Replace

   2.  Append

   To both of the transaction types, a Activation condition can be
   applied. This expression, if evaluating to False (.F.), allows for
   setting a condition that will prevent the system from processing the
   transaction. In order to set this condition, select the transaction and
   press Ctrl-Enter.