OpCode corresponds to the PSQL API Operation code which is to be performed. Setting this code to another operation code changes the operation performed. Setting this code to zero cancels the operation. Setting either InsertRec or UpdateRec to True inserts or updates the current record, respectively, before executing the operation specified by OpCode. You should not make any calls to the Btrv function using the associated VAccess control, or set any record operation properties of the VAccess control in response to this event, as doing so could result in an infinite loop or have other unpredictable consequences.