3.2 Variables

The following built-in variables are specific to the Aggregation agent.

Variable	Description
`session` - Batch and Real-Time	A reference to the current session to be used to access variables defined in the Association tab. A session will remain in the database until manually removed. A route to ECS or an alternative route will not remove it. The variable is available in the `consume`, `sessionInit` and `timeout` function blocks. Example - Using session session.duration = input.duration + session.duration;
`instruction` - Real-Time Only	An optionally inserted string, belonging to the currently flushed session. The variable is available in the `command` function block only. Example - Using instruction input.info = instruction;