Hello,
I’m not sure to understand your problem right. But, if you want to provide anonymous access to a particular website, as it is done in demo.piwik.org, you have to enable “Anonymous access” to the specific website you track under menu : Parameters → Users → Drop down list for website then set “Read” for user “Anonymous”.
The demo plugin is only a sample pllugin to help understanding how to build plugins.
If you want to generate visits, you can use the plugin “VisitorGenerator” .