Thank you for posting this question about the SlingPlayer for Web application. Yes, you can connect to different Slingboxes on your PC at the same time. Simply open a new tab in your browser, navigate to newwatch.slingbox.com, and choose the Slingbox you want to connect to. Alternately, you can open a different browser (Chrome, Firefox, or IE) and follow the same steps.
- Brett, PM at Sling