> For the complete documentation index, see [llms.txt](https://docs.urbit.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.urbit.org/urbit-os/kernel.md).

# Kernel

Guides and API documentation for the Urbit OS kernel, including Arvo and the various modules.

* [Arvo](/urbit-os/kernel/arvo.md) - The kernel itself. Implements the event loop and otherwise acts as air-traffic-control between the modules.
* [Ames](/urbit-os/kernel/ames.md) - Ames is the name of our encrypted peer-to-peer networking protocol and the module that communicates over it.
* [Behn](/urbit-os/kernel/behn.md) - Timer module. Allows Urbit OS and third-party applications to set and respond to timer events.
* [Clay](/urbit-os/kernel/clay.md) - Revision-controlled filesystem.
* [Dill](/urbit-os/kernel/dill.md) - Terminal driver. The Urbit runtime sends keyboard events to Dill from the terminal, and Dill produces terminal output.
* [Eyre](/urbit-os/kernel/eyre.md) - HTTP server. The runtime sends HTTP requests to Eyre, and Eyre forms HTTP responses.
* [Gall](/urbit-os/kernel/gall.md) - A framework for running state machines and third-party applications.
* [Iris](/urbit-os/kernel/iris.md) - HTTP client.
* [Jael](/urbit-os/kernel/jael.md) - Manages networking keys and Azimuth state.
* [Khan](/urbit-os/kernel/khan.md) - Thread dispatcher, the kernel's alternative to spider.
* [Lick](/urbit-os/kernel/lick.md) - IPC module for communicating with processes on the host machine.


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