There are basically two options for connecting to a computer using TeamViewer: 1) Using their auto-generated ID and password (i.e. give your partner ID and pass

There are basically two options for connecting to a computer using TeamViewer: 1) Using their auto-generated ID and password (i.e. give your partner ID and password to your nephew and he can log in to your computer using his TeamViewer client), and 2) Sign up for a TeamViewer account and add systems to your account that you can basically just click on and access. TeamViewer describes it as a "business" account but anyone can sign up for an account and use the system in that way.