Despite the long-running complaints, Microsoft’s Windows operating systems are quite good. They are, however, complex and you have to configure them properly.
Windows Hidden Settings
Of course a lot of the settings are hidden, which makes good sense but makes things a bit harder to configure. 
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Windows computer systems without Terminal Services licensing can only accept two (2) concurrent Remote Desktop (RDP). Sessions. This can occasionally cause Windows Administrators and Tech Support personnel problems since users often do not properly close their RDP sessions. This prevents the Admin or Support personnel from opening sessions of their own in order to work on issues.
There is actually a simple, if not widely publicized, fix for this problem.
If you’re using MSTSC version 5.x, installed by default on Windows XP, Windows Server 2003, and Windows Vista SP1 systems, enter the following from either RUN or CMD:
mstsc.exe /console
If you’re using MSTSC version 6.x, installed by default on Windows Server 2008, Windows Vista SP2, and Windows 7 systems and upgradeable to from Windows XP, enter the following from either RUN or CMD:
mstsc.exe /admin
In either situation using mstsc.exe with the appropriate switch – /console or /admin – will connect you to Session 0 on the remote system, bumping off another connection in order to do so if necessary. Then you can do whatever work that you need to do.
