I'd say so. My first test/demo was my virtual coffee factory over on my blog.

The browsers uses Websockets to communicate with the webserver. And the webserver uses Clacks to communicate with the single instance of the virtual factory. It sync across all webbrowsers that show the page. If you put it in manual mode, you can control it yourself, but it's intentionally hard. But with a friend or two helping you from their computers sharing the tasks, it's quite possible to run the thing in manual mode.

I'm also running a clacks-over-the-internet experiment where you can watch Henry the pear tree grow up. Currently it's not always on because my ISP works on upgrading local cabling and my bandwidth is very limited most of these days. Also, i might need to clean the camera again.