Commented walkthrough of the examples: <a href="http:&#x2F;&#x2F;learnrebol.com&#x2F;rebol3_book.html#section-1.2" rel="nofollow">http:&#x2F;&#x2F;learnrebol.com&#x2F;rebol3_book.html#section-1.2</a><p>Apparently these code examples accompany the author&#x27;s &quot;book&quot; on GUI Rebol programming.