According to a believable-looking screenshot posted on Reddit, nestled in the build's settings is a specific toggle for users to "Let apps on your other devices launch apps and continue experiences" on your PC via Bluetooth. With this, you could finish emails or tasks on your PC that you started on your phone or device.
This possible hand-off feature isn't a total surprise: Microsoft introduced Project Rome back at its Build developer conference earlier this month, with early demos hinting that the tech will work much the same way as Apple Handoff. But Rome is expected to differ in several ways, like transferring data between a device and computer via WiFi in addition to Bluetooth. Like the Redstone screenshot above, Rome aims to "connect experiences," running apps on both devices that trigger certain activities: for example, posting a trivia question on your device after a certain point watching a film on your PC.