If you can't wait to see how Siri works on Apple's upcoming desktop platform, head over to beta.apple.com. Cupertino has just released the public beta of macOS Sierra, and you can download it today from the company's website. We took an earlier iteration of the OS for a spin in June, so you probably already have an idea of what to expect. Besides Siri, it also introduces a picture-in-picture mode for iTunes and Safari, a universal clipboard for macOS and iOS, a more feature-rich messaging app and a redesigned iTunes. Apple has made a few changes since then, though, including switching up Siri's keyboard shortcut from Fn-spacebar to command-space hold.