The sender of a message specifies the SENDER and SENDERID keywords to identify itself. Copies of the specified values are presented to the target.

The SENDER specification is a text string intended to identify the sender of the message, either the client or the server. In cases where a server is sending a response message, consider specifying the server name. In cases where a client is sending a request, consider specifying text that allows installations and service personnel to identify the client application that sent the message. For example, include the job name as part of the sender name.

The SENDERID is intended to be a token that can uniquely identify the sender. When a server sends a response, consider specifying the server id of the server. When a client sends a request, consider specifying a value that uniquely identifies the client. For example, include the TTOKEN of the sending task as part of the SENDERID.