Protocol and Communications Library The protocol and communications library creates the interface between the Tivoli SecureWay Application Management Toolkit and the custom application. This library performs all launching, communicating, and error handling functions of the custom application. This appendix describes the following topics: ¶   The Protocol” ¶   Format of Record Data” on page 89 ¶   Format of Error Messages” on page 90 The Protocol The Application Management Toolkit uses a simple, clear text protocol. All commands, including errors, are capitalized (for example, MODIFY). For each command sent, an ACK must be received from the other side. The ACK indicates either that the command is acknowledged, or that the command succeeded. All record data is followed by an _EOD_ string, indicating  end of data. The following table defines the protocol, as seen during command execution. A 81 Tivoli®  SecureWay Application Management Toolkit Guide