Windows 7 has better access control then vista and XP and with user account control all the process are launched in protected mode even if you logged in as administrator. In case if you have installed windows 7 on another computer present in your network then only way to access it from your own machine is using remote desktop.
But if some one already logged on windows 7 then you wont be able to login as windows 7 by default doesn’t allow concurrent sessions. If you try to login to windows 7 while another users is already logged in locally or remotely then a message will be displayed as show in below screenshot.
Only one user can login to windows 7. Well don’t worry some one has already found the way to allow multiple user login to windows 7 i.e Concurrent User Sessions. Here is guide to enable concurrent user sessions on Windows 7.
Lets begin,First, Download the Patch Here
Click "Save" to save the download.
For easy access, save the download to the desktop. To do this, click "Desktop" on the left side of the Save As window and then click "Save" in the bottom right corner. Once the download completes, click "Open" or look on the desktop for Win7RDP.zip, double-click to open the compressed file.
Inside of the Win7RDP.zip window you will find the 4 files needed for this patch. Click "Extract all files" at the top of the window.
The Extract Compressed (Zipped) Folders wizard will then start. Erase the text from the extract to field and type in "C:\Win7RDP." Click on the box next to "Show extracted files when complete" to automatically open the extracted folder after extraction. Once completed, click "Extract" at the bottom.
The extracted Win7RDP folder will open automatically after extraction. If not, open the Start Menu, click "Computer," double-click "Local Disk (C:)" and then double-click the Win7RDP folder.
Inside the Win7RDP folder you will see install.cmd, right-click on install.cmd and then click on "Run as administrator" to launch the patch as an administrator.
The rest of the patching process is automated. The install.cmd will take ownership and replace RDPs termsrv.dll with either the 32 or 64 bit patched version. Next it will update the remote desktop protocol rules, enable remote desktop and start the remote desktop services. The entire install.cmd runs in a split second, press any key to close the window.