Remote assistance from Remote Desktop sessions: unable to control

Good news - this is officially back in Windows 2012 R2.

From http://technet.microsoft.com/en-us/library/dn283323.aspx:

In Windows Server 2012 R2 Preview, Session Shadowing enables you to remotely monitor or control an active session of another user on a Remote Desktop Session Host (RD Session Host) server. The current version includes integration with Server Manager and Remote Desktop Connection (mstsc.exe).

EDIT: Just noticed TheCleaner's answer, but I guess it wouldn't hurt to have a officiall source from Microsoft.

I've only heard speculation that it will be coming back (literally everyone is mad about this being gone from 2012 after all), but it is not available as a supported function from Microsoft at this time.

However, this blog post is about the best workaround that I've come across. Perhaps it can be a suitable workaround in the interim.

Look what's back syneticon-dj:

Enhanced Virtual Desktop Infrastructure (VDI) in Windows Server 2012 R2 with improvements in management, value, and user experience. Session Shadowing allows administrators to view and remotely control active user sessions in an RDSH server.

http://microsoftplatform.blogspot.com/2013/06/what-new-in-windows-server-2012-r2.html

Let’s start with the big feedback item Microsoft got after the release of Windows Server 2012 and that is bring shadowing (Remote Control) back!

And also, it’s now fully supported to Shadow RemoteApps!!