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リモートデスクトップをConcurrent状態にした場合に、同じユーザーが複数のセッションを使えないようにする
Start Registry Editor (by default, this is located at c:\windows\regedit.exe).
Go to the following registry key:
HKEY_LOCAL_MACHINE\
System\CurrentControlSet\Control\TerminalServer
If the fSingleSessionPerUser value doesn't exist, create a new DWORD value named fSingleSessionPerUser
Open the fSingleSessionPerUser value. The possible values for this setting are as follows:0x0
Allow multiple sessions per user
0x1
Force each user to a single sessionEnter the new setting, and then click OK.