# ISession Interface

Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/November2024/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)  
Assembly: Qlik.Engine.dll

Contains Information to attach to a specific qlik engine session When connecting to a Qlik Sense app you can work with sessions. Sessions specify who should see changes in an app, and are based on combining userId and session key.

## Syntax

```
public interface ISession : ISession
```

## Remarks

Only one app can be open in a session at a time

## Properties

| Name | Description |
| --- | --- |
| [AppIdentifier](https://help.qlik.com/en-US/sense-developer/November2024/Subsystems/NetSDKAPIref/Content/Qlik.Engine.ISession.AppIdentifier.htm#Qlik_Engine_ISession_AppIdentifier) | App identifier |