you just simply press the CTRL+ALT+DELETE= You can log onto the windows acount then just simply log out the same way
some data will performed in your hidden process so only you can't log off your computer
Many reasons. Screensaver Hibernation Wrong Resolution Wrong Input (Digital / Analogue) No Signal (Check Cables) Screen not turned on (It happens) Graphics Card Fault Screen Fault
there are numerous ways. one way is pressing ctrl+alt+delete together then clicking log off. or you can log off via the start menu you are wrong
Open an internet browser (Mozilla Firefox, Chrome, Safari, Opera), type www.twitter.com and you can log-off your twitter account there by clicking your user name and go to "sign off".