Word is going around that Microsoft is planning to bring the Windows Phone's Cortana assistant to Windows as an answer to Google's Now and Apple's Siri. However, new details suggest Cortana will not be an integral part of Microsoft's next operating system but will be offered as a simple app.
But how does Cortana work? As of right now, Cortana is an app; it’s a simple app that opens up the personal digital assistant where you can then either type in your question or ask verbally inside a smallish window. It's not a full screen experience like you see on Windows Phone.
The app itself currently looks similar to that of Windows Phone, but takes up roughly 25% of your display with Cortana being in the center; Cortana maintains her circle shape and is animated too.
Cortana is expected to integrate into the OS as well, much like she does on Windows Phone, but at this time the deep integration into Windows Threshold is slim but there are plenty of time for improvements.