# User OS

This wildcard will be substituted with the client's operating system (referring to the client connected to the browser).

The valid values for this wildcard include:

* mac
* win
* linux

{% hint style="info" %}
This wildcard tells you the operating system of your client, accessing the Helmut4 website, the operating system of your job/stream might be another - consider to have a look into this wildcard [local OS](/helmut4-releases/helmut4-components/streamdesigner/wildcards/local-environment-related-wildcards-6/local-os.md)
{% endhint %}

{% hint style="warning" %}
Please note that Helmut4 employs case sensitivity for all types of variables.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.helmut.de/helmut4-releases/helmut4-components/streamdesigner/wildcards/user-related-wildcards-10/user-os.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.