what are best practices for showing help information
<p>I would like to put fairly extensive help information within my app - both "how to use" and explanation of what one is seeing.</p>

<p>The app (map oriented) has a row of buttons at the bottom, and I was considering adding a help button.</p>

<p>Context sensitive help is mostly not appropriate, btw.</p>

<p>What are common and best practices for this? </p>

<p>Thanks</p>
