> For the complete documentation index, see [llms.txt](https://docs.dqman.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dqman.com/veeva-vault-edition-23.2/session-window-vql-mdl.md).

# Session Window: VQL, MDL

Once logged in, you can work in the Session Window in any of the following editors/views:

<img src="/files/l57nJvIabLAr0Ffftp8v" alt="Session Window View Options" width="116">

* **VQL**: edit & run VQL queries
* **MDL**: edit & run MDL statements and scripts

You can switch anytime between these views using the above toolbar buttons or the **View** menu. Changing the view does not delete any existing commands or results in other views; moreover, during script debugging, you can execute commands in other views without stopping the debug process.

You can use the below toolbar buttons to execute your VQL queries/MDL commands/scripts. It is possible to run/step into/pause/stop VQL queries/MDL scripts.

<figure><img src="/files/Zfl3njj0489R921ma5qo" alt=""><figcaption><p>Toolbar buttons for running and controlling execution of VQL and MDL code</p></figcaption></figure>

{% hint style="info" %}
Note that some of the above commands may not be available depending on the type of code being executed and/or if execution times are too short for the user to interact with the buttons during runtime.
{% endhint %}