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title: DataLens On-premises workbooks and collections
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In this tutorial, you will learn about DataLens On-premises workbooks and
collections, their features, and how to start using them.
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# DataLens On-premises workbooks and collections
DataLens entities are stored in special containers:
* A **workbook** stores [connections](../concepts/connection/index.md), [datasets](../dataset/index.md), [charts](../concepts/chart/index.md), [dashboards](../concepts/dashboard.md), and [reports](../reports/index.md). Entities within a workbook may only refer to each other.
* A **collection** is a container used for grouping workbooks and other collections.
More on how to work with a [workbook](./workbooks-operations.md) or [collection](./collections-operations.md).
## Viewing linked objects {#related-objects}
You can look up where the object is used or which objects are used by it. Do it by clicking → **Linked objects** on the workbook page or object editing window. For example, this can give you a clue as to the sources used to build a dashboard or the charts based on a certain dataset.
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If you get an error when opening the linked object window, click **Retry**.