# Stream Variable ?

This wildcard is replaced with the value of a previously set, temporary variable. These temporary variables must be set within the stream and are only available while the stream is running.

{% hint style="info" %}
Temporary variable exist only in the current, running stream.

\
Although it is possible to forward them to another stream via [Job Create Job Action](/helmut4-releases/helmut4-components/streamdesigner/nodes/actions/job-action/job-create-job-action.md) or [Stream Execute Generic Stream Action](/helmut4-releases/helmut4-components/streamdesigner/nodes/actions/misc-21/stream-execute-generic-stream-action.md).\
\
In case the following stream is setting a temporary variable with the same name, the previous one will be overwritten!
{% endhint %}

### Use of the wildcard

The wildcard is used in the following ways:

* Variable name: test1
* Variable value: hello<br>
* {stream.variable.?}
* For the following input (?) --> test1
  * {stream.variable.test1}
* The output is going to be --> hello

<figure><img src="/files/ohiFHv98xDK2hAI3XM8D" alt=""><figcaption><p>Stream Set Temporary Variable Action</p></figcaption></figure>


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