Search notes:

query.exe

MultiUser Query Utility
query process
query session
query termserver
query user

query session

C:\>query session
 SESSIONNAME       USERNAME                 ID  STATE   TYPE        DEVICE
 services                                    0  Disc
                   Rene                      1  Disc
>console           Freddie                   2  Active
 rdp-tcp                                 65537  Listen
See also HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\SessionData

query user

C:\>query user
 USERNAME              SESSIONNAME        ID  STATE   IDLE TIME  LOGON TIME
 rene                                      1  Disc         1:48  9/6/2019 10:26 PM
>freddie               console             2  Active       1:48  9/7/2019 7:24 AM

query process

C:\>query process
 USERNAME              SESSIONNAME         ID    PID  IMAGE
>freddie               console              2   5868  sihost.exe
>freddie               console              2   7760  svchost.exe
>freddie               console              2   4980  taskhostw.exe
>freddie               console              2   7972  explorer.exe
>freddie               console              2   8392  smartscreen.exe

See also

quser.exe
Example: Switching between user sessions in the command line
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations

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