# 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. --- # 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://docs.urbit.org/urbit-os/kernel.md?ask= ``` 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.