Thread:Extension talk:VisualEditor/Parsoid-Port for VisualEditor: What firewall settings?

I'm setting up a MediaWiki on a Windows 7 system with XAMPP. I have now everything running including Parsoid on Port 8000. My question is, do I need to open port 8000 to the outside, so VisualEditor running in the client's browser can have access to Parsoid? Or does the Parsoid.php extension in the MediaWiki (server-side) map that locally - and can I therefore block Port 8000 to outside access?