Cortex API
A session is an object that makes the link between your application and an EMOTIV headset. When the user wants to work with a headset, your application should create a session first. Then you can:
Your application can open only one session at a time with a given headset. But it can open multiple sessions with multiple headsets.

A session is created by createSession and closed by updateSession.
A session is linked to an application. All the sessions of an application are automatically closed when the application is disconnected from the Cortex service. A session is also closed if the headset is disconnected.
A session is a temporary in-memory object, it is not persistent. After a session is closed, it is destroyed by Cortex. If you want to create a persistent object, please create a record inside your session. See Records for details.

When you create a session, you can activate it or leave as is.
If the session is not activated, then it doesn't use the license of the user. You cannot subscribe to the EEG stream and you are limited to the low resolution performance metrics. You can neither create a record nor markers.
If the session is activated, then it uses the license of the user. Depending on the license scope of the license, you can subscribe to the EEG stream or high resolution performance metrics. If the license has a session quota, then this session will be debited from this quota.
Use querySessions and check the field status to know if a session was activated or not.
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Session lifetime
Session activation