Login on Windows account without password


Is it possible to login to Windows PC where we have defined two users (Administrator and Standard user) without user passwords?

Here is the thing: Users have their own passwords for their Windows accounts. We need to connect to their Windows user in order to do something. But, in case that they are away, we can not login because we do not know their passwords. We would like to be able to login to Standard user account without their passwords.

Note: Teamviewer is running on Standard user account.