Here's a step by step guide on how to run multiple concurrent RDP sessions.

My Test system configuration:
Laptop running Windows 7 Enterprise (Windows Pro is recommended) - Main System

Other Devices (clients):
Iphone 3
Ipad
Galaxy Tab 3

Required Software Patch:
2X Client for Desktops, Mobile Devices - http://www.2x.com/rdp-client/2.6K

Patch/crack Required to enable-concurrent-multiple-RDP-sessions:

Windows 7 patch:
UniversalTermsrvPatch_20090425.zip (132.5 KB)

Windows 8/8.1 Patch:
termsrv.dll_patched-win8.zip (421.6 KB)

http://samarthparikh.blogspot.com.br/2008/10/enable-concurrent-multiple-rdp-sessions.html5.0K

Step 1: Configure Remote Settings

Go to Control Panel, System, Remote Settings

Remote Settings.png1053x727 153 KB

A: Select Allow Remote Assistance connections to this computer check box

B. Select Allow connections from computers running any version of Remote Desktop to allow people using any version of Remote Desktop or RemoteApp to connect to your computer. This is a good choice if you don't know the version of Remote Desktop Connection that other people are using, but it is less secure than the third option.

or

Select Allow connections only from computers running Remote Desktop with Network Level Authentication to allow people with computers running versions of Remote Desktop or RemoteApp with Network Level Authentication to connect to your computer. This is the most secure choice if you know that the people who will connect to your computer are running Windows 7 on their computers. (In Windows 7, Remote Desktop uses Network Level Authentication.)

C. Add Use Account for each RDP device.(in My example i have added Test 1 and Test 2.

Test 1 user account (standard user) will connect using Iphone
Test 2 user account (standard) will connect using IPAD
Morshed user account (Admin) will be configured on Galaxy Tab.

Step 2: Install Patch Required to enable-concurrent-multiple-RDP-sessions:

My system is Windows 7, so i'm going to configure Universal Termsrv.dll Patch for Windows 7.

Choose the corresponding patcher based on your Windows 7 :
For 32bit(x86): U**niversalTermsrvPatch-x86.exe**
For 64bit(amd64): UniversalTermsrvPatch-x64.exe

Require administrator rights. Right-click the exe file, select Run as Administrator.

Step 1.1.png895x565 78.8 KB

Click on Patch to Install

Step 2.png1150x427 134 KB

Click on OK

Step 2.1.png1077x467 146 KB

ClickYes to Restart- Installation complete.

Step 2.2.png1075x641 161 KB

Note: If wanted to restore the original Termsrv.dll file you can run the Universal Termsrv.dll Patch utility and select restore.

http://forum.sambapos.com/t/step-by-step-on-how-to-configure-multiple-concurrent-rdp-clients-to-run-sambapos-iphone-ipad-galaxy-tablet/769