# Definitions

The definitions describe the system fields, which do not include the default prefix tibss-.

System Fields
Field Name | Description
--- | ---
envelope | The Substation ES context information that is used during a CICS and IMS request or reply application communication or during IMS application conversational interaction.
userid | The user identifier required by Substation ES and the BES.
password | The user password required by Substation ES and the BES.
correlationid | The dynamically supplied correlation ID value from an inbound message and it may puts in the output message.
resource | The dynamically supplied name of the resource to be executed in the BES in the payload or message.
BES | The dynamically supplied name assigned to the Substation ES interface for communicating with the transaction processing systems (such as CICS and IMS) in the payload or message.
MFS-Name | The dynamically supplied MFS Map Name to be used in IMS BES.
tran-code | The dynamically supplied user transaction name to be executed in the BES in the payload or message (CICS usage only).
rro-tran-code | The dynamically supplied four-character identifier for the transaction responsible for running the program on the remote CICS system.
rro-sysid | The dynamically supplied four-character system identifier for the CICS region where the program ultimately is run.
service-id | Substation ES adds this field to the user message. The content is this service's identifier.
ss-id | Substation ES adds this field to the users message. The content is this Substation's identifier.

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