# Custom events
**Custom events are special nodes which can alter the flow, allowing for a cleaner and more readable graph. They are also used to execute actions based on inputs deriving from an user interface.**
## Using custom events
To create a custom event, add it as an usual node and give it an unique **EventName** (which will be id the caller will need to use to call it). To call the custom event, add a **CallCustomEvent** node and use the same **EventName** as the **CustomEvent** node.
{% hint style="warning" %}
* Custom events can't have the same **EventName**. Names must be unique. Failing in so results in a building error.
* **EventName** inputs are case sensitive. Always check if the two names correspond or use copy and paste to minimize the chance of typos. Event callers without a corresponding **EventName** will result in a building error.
{% endhint %}
## UI custom events
Custom events are also used to receive inputs from user interface elements and execute an action with them. They can either receive a **boolean** or **single** (float) value.
UI nodes passing a boolean argument are:
* AddCheckbox
checkbox ui node passing a boolean value to a custom event
UI nodes passing a float argument are:
* AddSlider
slider ui node passing a single (float) value to a custom event
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