If I understand your question correctly, you can't currently RDP into your Rpi2 device from your desktop. (Or go the other way either).
The closest option we currently have is that you can use powershell to remote into the device:
http://ms-iot.github.io/content/win10/s ... rShell.htm
We also offer the WebB management page on the device which you can access by opening a browser and entering http://<ip of Rpi2 device>
I hope that helps.
Jonathan Tanner | Microsoft | Windows 10 IoT Core Insider Preview Support | This posting is provided 'as is' with no warranties and confers no rights.