On sleep, you should be safe but it depends on your settings. If you want to be certain nobody can use your machine while you're not sitting in front of it, your best bet is to disconnect the computer from the network, hibernate or shut down. Teamviewer may still transfer files as Martin Fürholz mentioned.

If you lock your PC, most forms of remote control become more inconvenient for the attacker but you're certainly not completely safe. Other software, notably Remote Desktop, interacts with your user session directly which is why you can log in with Remote Desktop even when the computer appears locked to a physical person sitting there. This is why anything seen through Teamviewer is the same as what the physical person in front of the computer would see. Teamviewer interacts with Windows as if an extra keyboard/mouse/monitor were plugged in. Any processes you have open in your user continue running and this is why you can download a file and lock your computer, and it will continue downloading while your computer is locked. For instance, you could use it when you need to help a friend fix his computer, and you don't want to create a TeamViewer account.Locking a Windows computer with Windows+L simply prevents the physical user from interacting with any of the processes running within your user. This method is suitable when you don't need frequent remote access to the target computer or device. The Partner ID is a code which allows to anyone using it to connect to that computer or device. How to connect to a computer or device using a Partner IDĪs we've already stated, the computer you are trying to connect must have installed the TeamViewer desktop app, which is able to generate a Partner ID. If the other computer or device you want to connect to is also running the TeamViewer: Remote Control app, you need to use a TeamViewer account and add the target computer to it, because the app doesn't generate a Partner ID. The TeamViewer: Remote Control app allows you to connect to another computer or device using two ways: a Partner ID or a TeamViewer account. You can't connect to a computer or device that doesn't have the TeamViewer service installed and running.

You can start a remote connection with devices or computers running the TeamViewer: Remote Control app or the TeamViewer desktop app. TeamViewer: Remote Control, app, Windows Requirements for connecting to another computer or device using the TeamViewer: Remote Control app

Join teamviewer remote control session