Certain TDP commands, however, initiate a process or modify the state of a process. For example, a START CP or START NP command causes TDP to establish communication with the database. In such a case, TDP first returns an immediate response, essentially indicating whether the command was accepted or not. If the command is accepted, TDP monitors the completion of the process.
After the requested process has completed, TDP sometimes issues an asynchronous status message describing the results of the process. This message is not considered a command response, and is not therefore routed to the originating userid. Instead, the message displays on the TDP console. (In most cases, the user can enter other TDP display commands to obtain the new status of the process.)