Concurrent Sessions allows you to Remote Desktop (RDP) into a system that someone else is on, under a different user account, and access the system without kicking the user off. I, for example, use the feature to have MCE running on my Television, and then I remote into my main user account to access all my files without interrupting my MCE session.
If you’ve installed Windows 7 Beta (download) and want to test on another computer without physical instllation, here are the steps: download the appropriate files, and extract into a directory. Right click on the Install.cmd file and select Run As Administrator from the context menu.
Extra abilities are available via command line arguments: -multi enable multiple sessions per user, and -blank allows remote log on for user accounts that are not password protected. To utilize them, just create a shortcut and add them to the end of the target like: C:\Concurrent_RDP_Win7_Beta_7000> install -multi
Source:→ Download Squad