How can I enable concurrent Remote Desktop Sessions in Windows 8 Pro?
We'd like to do this just like we have on Windows Server 2003.
There is no official / approved way to do this.
Multi-user Remote Desktop (aka Terminal Services) is only supported on Server versions of Windows, and then only with the appropriate client access licensing.
There are 'hacks' for Windows 7 which modify the Terminal Services DLL to allow multi-user access.
None of these 'hacks' are official or licensed, and I've not (yet) seen one for Windows 8.
There is now a patch for Windows 8 but as the other users said, there is no official/approved way to do this.