Concurrent Remote Desktop sessions will allow more than one person use that system under a different or even the same user account, without kicking each other off.
Here is a tweaking tool allowing unlimited concurrent user access, through remote desktop connection in Windows 8.
Peter Kleissner has written and published a little utility which does all the job automatically.
If you are try to Remote Access 2 or more accounts into one Windows 8 machine at the same time, you’ll get “Another user is signed in. If you continue, they will be disconnected“.
But here is a tweaking tool that can alter this setting, allowing unlimited concurrent user access, through remote desktop connection in Windows 8.
NOTE: Before you do, create a system restore point or back up termsrv.dll file in c:\windowssystem32 folder, just in case something goes wrong along the way.
Once downloaded run the patcher, tweaking the termsrv.dll file and automatically restarts your computer in 8 seconds.
After the reboot you are ready for multiple RDP.