> For the complete documentation index, see [llms.txt](https://horizongames.gitbook.io/kronos-matchmaking/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://horizongames.gitbook.io/kronos-matchmaking/usage/lobby/updating-lobby-session.md).

# Updating Lobby Session

In most cases you will want to update the **Session Settings** of the lobby at some point because of changes in the game (such as playing on a new map).

## Updating Session Settings

To update the **Session Settings** of a session you first have to get a copy of its current settings, make the changes on the copy, and then push the changes back to the session through the **Online Subsystem**. The `KronosOnlineSession` class contains all the necessary functionality to update sessions.

{% hint style="info" %}
The lobby is considered a **Game Session** since it is used as part of an online match.
{% endhint %}

{% tabs %}
{% tab title="Blueprint" %}

<figure><img src="/files/usNoiSD7tH5E616CWR0S" alt=""><figcaption></figcaption></figure>
{% endtab %}

{% tab title="C++" %}

```cpp
#include "KronosOnlineSession.h"
```

```cpp
// Get the online session. Note that the OnlineSession class is the manager
// and not the actual session we are updating!
UKronosOnlineSession* OnlineSession = UKronosOnlineSession::Get(this);
if (OnlineSession)
{
    // Get the current session settings for the match that we are in.
    FKronosSessionSettings UpdatedSettings;
    if (OnlineSession->GetSessionSettings(NAME_GameSession, UpdatedSettings))
    {
        // Change the playlist of the match.
        UpdatedSettings.Playlist = TEXT("NewPlaylist");

        // Whether we want to push the changes to the backend (e.g. Steam) or not.
        // If this is false, only the local player's view of the session will be updated.
        bool bRefreshOnlineData = true;

        // Update the session. This operation is async and may not finish immediately!
        OnlineSession->UpdateSession(NAME_GameSession, UpdatedSettings, bRefreshOnlineData);
    }
}
```

{% endtab %}
{% endtabs %}

## Important Note About Null Online Subsystem

The **Null Online Subsystem** doesn't support updating data online, so only the local player will see the changes. For other limitations of the Null OSS please refer to [**Using the Null Subsystem**](/kronos-matchmaking/testing-and-debugging.md#using-the-null-subsystem) section of the documentation.