In most cases you will just need to enter your system password to unlock your computer after you have successfully connected to you host Mac or Windows PC.
To unlock Windows XP Professional, Vista, Windows 7 or Windows 8
1. From the Viewer menu, click the Send Ctrl-Alt-Del button or choose Tools and select Send Ctrl-Alt-Del.
2. Enter your Windows ID and password to unlock your Windows PC as you normally would.
Note: If the Send Ctrl-Alt-Del feature is not functioning on a host PC with Vista or Windows 7, then the Secure Attention Sequence (SAS) may be disabled. For more information, please see Enable GoToMyPC to Send Ctrl-Alt-Delete on Vista and Windows 7.
To unlock Mac OS X v10.5 and Windows XP Home (or XP Professional with Fast User Switching)
1. If the screensaver is running, move the mouse to display the log-in screen.
2. Log in to your Mac or Windows PC as you normally would.