> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/core/viewer/samples.md).

# PDF viewer code samples on Server/Desktop

Discover how to customize the PDF Viewer Control with advanced tools and GUI elements in this sample. Learn about the Simple version for basic projects. The Apryse Server SDK streamlines secure docume

[PDF Viewer Control (Advanced)](/core/get-started/samples/pdfviewform.md) This sample shows how to customize the viewer control by implementing a number of custom tools (such as freehand tool, link creation tool, rectangular zoom etc) and custom GUI elements (such as custom navigation and printing).

[PDF Viewer Control (Simple)](/core/get-started/samples/pdfviewsimpletest.md) This sample shows how to use PDF viewer control in a basic project.


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# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.apryse.com/core/viewer/samples.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.