While not officially supported from Microsoft, a developer has been able to get Continuum working on their Lumia 830 running Windows 10 Mobile. It appears as though a quick Registry edit will enable the feature, though that doesn't mean that everyone should try it. Gustave M, as spotted by NPU, has posted on Twitter about the process.
They say it's not possible to enable on a 830 pic.twitter.com/59M1yOPT42— Gustave M. (@gus33000) August 4, 2016
At this time, directions for how to complete the task have not been posted. Would you like to see Microsoft enable this functionality on older handsets as well? Let us know your thoughts in the comments.