Sadly, this isn’t possible on this platform. The reason lies in the fact that on TeamViewer it is not possible for two people to be logged in from the same device. However, there exists a catch in this as well. Even though you cannot log in without another person at once you may however make two different connections on TeamViewer to the same computer on the same screen at the same time. However, this is not the same as a make-believe connection to a virtual screen. Those services are only provided by remote desktop connections and Terminal viewer on windows.