# Behn 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: 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/behn.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.