The connection to your PC for performing the online unlock is done using Teamviewer, which is the leading company for remote support services, having over 60 million users.
By using this program, we can connect to your PC for doing the unlock, you will see everything that we are doing, be able to control the PC and can close the connection anytime by closing the program.
This program generates a new password each time you restart it and only the person to whom you send your id and password can connect to your PC, and stay connected as long as the program Teamviewer is open.
Once the program is stopped the other person gets disconnected and will not be able to connect unless you reopen TeamViewer and send the new password.