# 2.4 Host key of VirtualBox

VirtualBox uses the right "Ctrl" key as the Host key by default, as shown at the bottom right-hand corner of the VM's window. By pressing the "Host key", you may attach/detach your input devices to/from the VM.**When you intend to press/issue "Ctrl" inside the VM, use the left "Ctrl" instead of the right one to avoid confusion.**


---

# Agent Instructions: 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:

```
GET https://eric-lo.gitbook.io/lab1-linux-basic/2-try-the-vm/24-host-key-of-virtualbox.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

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.