# Sessions

A Nuvolos application is a set of resources and associated configurations. When you start the application, an **application session** is created. Every session is a single continuous run of the application, identified by an unique session identifier - `session_id`.

An application's current and previous session information is available in Nuvolos. To access the session history of an application, open the Sessions page under the Actions button in the Applications list:

1. Navigate to the space containing the instance where you want to view sessions.
2. Navigate to the instance containing the application.
3. Make sure you are in the **Current state**.
4. On the sidebar click the Screen button (**Applications**), which shows you the Application list.
5. On the row of the application of interest, click **...** under **Actions**.
6. In the drop-down click **SESSIONS**.
7. The screen shows the sessions now for the given application.

By default, the following information are shown:

* Start / Stop Time
  * Timestamp of when the session was started and/or ended. An active indicator for the stop time column means that the application is still running.
  * Search and filter for a specific **date** using the Start time column
* Runtime
  * Actual running time (HH:MM:SS) of the application's session
* [Size](/features/applications/application-resources.md#size-and-price-of-an-application)
  * Resource configuration (CU / Node pool) used for the application at the time the session was started
* Credits Spent
  * Total credits spent for a specific session
  * Only applicable to [credit-based sizes](/features/applications/application-resources.md#size-and-price-of-an-application); not available for CU configurations
* Actions (**...** menu)
  * View the saved [logs of the application session](/features/applications/sessions/session-logs.md) - click on **SEE LOGS**.

## Adding Columns to the Session History Viewer

The application session history view can be updated with additional information. To add more information, click the **COLUMNS** button on the top left.

Other columns/information available:

* Session id
  * Unique session identifier. Use this in support requests to specify the run in question.
* Start / Stop user
  * Display name of the user who started or stopped an application session. The stop user can be different from the start user for
    * Shared applications, where a different user stopped a session.
    * Applications terminated by the System Scheduler, due to [inactivity](/features/applications/long-running-applications.md#automatic-stopping-due-to-inactivity).
* Sidecar size
  * Total CU size of **all the sidecars** (a.k.a. [Add-ons](/features/applications/add-ons.md)) configured to run alongside the application for that session.
* [CU hour](/help-and-reference/glossary.md#cus)
  * Total CU hours consumed for the session
  * Includes the main application CU usage (which is configuration-dependent) and **all** the sidecar CU usage (if run alongside).


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