By clicking on the pict you download a small bit of software. When you run it you first get a 9-figure connection ID.
It will always be the same 9 figures. Then you get a 4-digit password. I need both to be able to connect to your computer to give you the remote support. The 4-digit password is random for each session. This is your security. That means i can not access your computer unless you agree for each session.