Docs ms shadow the console

From Remote Desktop Wiki

The following instructions allow a Terminal Server user to "shadow" the user logged in physically at the console as opposed to launching a "console" Terminal Server session.

Log into the Terminal Server with your usual administrative account. Once in, execute the following command within the command prompt:

shadow 0

The console will then be asked to allow or refuse the connection. If it is accepted the session begins, if it is denied the sessions ends.

For more information, refer to Microsoft Article 278845.