> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Interactions

Some blocks allow you to select and edit inputs through interactions in the Viewport.

![Select](https://storage.googleapis.com/files-learn/static/images/using-blocks/select.gif)

## Viewport Select

You can tell inputs are interactive when this symbol appears when you hover over the input:

![Select](https://storage.googleapis.com/files-learn/static/images/using-blocks/selectv.png)

* Selecting the symbol toggles on the Viewport select mode.
* The input turns blue and prompts you to choose a part from the Viewport.
* Parts are highlighted when you hover over them.

## Placement Gimbal

Most Point inputs have a corresponding placement gimbal that allow you to move the part in the Viewport. Select an axis beam or the squares between them to adjust the placement.

![Select](https://storage.googleapis.com/files-learn/static/images/using-blocks/gimbal.png)

## Interactive Updates

This feature requires GPU Acceleration to be turned on. Read about this feature in [GPU Acceleration](/_getting_started/_system_requirements/gpu_acceleration).