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77In this lesson we introduce the notion of a vane, which should be thought of as a kernel module for Arvo (if you don't know what that means yet, just keep reading). We first present a primer on what vanes are and how they communicate, followed by an examination of the simplest vane, known as Behn (pronounced like "bane"), which is Arvo's timekeeper.
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9−Following this lesson, we will introduce Gall, a vane used to build user space apps. Then we have a walkthrough where we construct an [egg timer](@/docs/tutorials/hoon/hoon-school/egg-timer.md) as a Gall app that interacts with Behn.
9+Following this lesson, we will introduce Gall, a vane used to build user space apps. Then we have a walkthrough where we construct an [egg timer](@/docs/hoon/hoon-school/egg-timer.md) as a Gall app that interacts with Behn.
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1111## Vanes
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