An interesting thing I didn't know about until today. On a laptop (tested on a notebook Toshiba) With Windows 8.1 keyboard can be blocked and total unlocked using a combination of keys. Windows Keyboard shortcut.
Putin is strange that a locked laptop keyboard can be removed from a keyboard shortcut. All you have to do is press buttons simultaneously: CTR + ALT + L to unlock it.
There are cases in which the keyboard can be due to problems Debochitsa hardware or drivers. In these cases we recommend either connecting a foreign typing until the problem is remedied, or connect to the laptop with the keypad locked, through a remote control program. TeamViewer for example.