> ## 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.

# Lists

All blocks in nTop can exist as singular entities or as a list. A ***list***contains multiple items of the same type in a single block, like a list of points. When a process runs on a list block, it runs the process on every list item. Working with list blocks is called ***List Processing***.

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Lists can be used in the input of CBs, so customized functions can be performed on multiple listed inputs at once.

**Want to List Process and don't know where to start?**

* Determine the input you want to iterate
* Open up the info panel and find the input type
* Search for that type of list in the notebook search bar (ex. Scalar List, Point List, Vector List…)

## List Properties

Each list contains a set of List properties at the top and individual properties for each item within that list grouped under List Elements. You can drag an individual property from a List to create an item in the notebook. You can expand the dropdown arrow next to the individual entities to reveal more information on that individual list entity.

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