# Local OS

This wildcard will be substituted with the operating system of the host (the client currently executing the job).

The possible return values for this wildcard include:

* Linux
* Mac OS X
* Windows 10
* Windows 11
* Windows Server \<version>
  * *This value is dedicated to Windows Server OS hosts*
* Unix

{% hint style="info" %}
This wildcard tells you the operating system of your host running the stream, the operating system of your client might be another - consider to have a look into this wildcard [user OS](https://docs.helmut.de/helmut4-releases/helmut4-components/streamdesigner/wildcards/user-related-wildcards-10/user-os)
{% endhint %}

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