Can you think of a method that allows you to render your PC’s desktop to a virtual computer screen (texture) in Unity? Is this within the realm of possibility?
There is the usual CoherentUI, which allows you to browse webpages within unity. It also allows the usage of HTML scripts within unity, so for example you can have a computer screen with Gmail open on it, for example, and the user will be able to interact and scroll through the webpage and login with their email account and browse it.
Hope you find this interesting!
For more information on CoherentUI, refer to the link below:
http://forum.unity3d.com/threads/156665-Coherent-UI-HTML5-based-User-Interface-middleware