www folder into Web pages on UserLand's Web server.
If you can spare a couple minutes, I'll show you a simple exercise from Radio UserLand Kick Start that makes upstreaming easier to understand:
Radio upstreams countdown.txt as countdown.html, using the file #template.txt as a template for the Web page.
You can use your new folder to experiment with page creation and template editing without messing up your weblog. Changes to the template and the text file will cause the page to be upstreamed again automatically.