> 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/behn.md). # Behn Documentation for Behn, Arvo's timer module for scheduling and managing timers. Behn is Arvo's timer module. Behn manages timers in a simple priority queue. Other modules and applications ask Behn to set a timer to go off at the given time, and Behn produces effects that start the timers in Unix. When the timer goes off, Unix sends an event to Behn, and Behn notifies the original requester. A timer event is a request to not be woken until *after* the given time. We don't guarantee that a timer event will happen at exactly the time it was set for, or even that it'll be particularly close. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.urbit.org/urbit-os/kernel/behn.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.