The computer saves whats on your screen and goes into a low power state so you can quickly return to it.
Yes you can.
Hibernate saves all content of RAM to your hard drive. That allows to start your work from the point you left it before placing your computer in hibernation.
You may have a hotkey on your keyboard, or you can go to Start > Arrow Beside Shutdown, Hibernate, Sleep etc. > Lock. I hope that this helps! Other Windows 7 tips are available at the link below.
Start->Control Panel->Power Options->Hibernate->enable hibernation
You have to have the item with Hibernate in shut down menu. If you don't have it, you have to activate hibernation mode. To do that you have to press Start->Run->cmd. In the cmd window type: powercfg -hibernate on.
You may not have hibernate enabled
The way I make my laptop hibernate is while on, briefly pressing the 'on' button for like second lightly. Hope that helps!
Stand by in windows is where the computer is still turned on and will resume when you want it to. Hibernate is where it saves your session (keeps what you are doing, yes everything) and then turns off the computer. When it is turned back on your session will be restored.
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Windows 7 is named Windows 7.
By going to the start menu ans shutting down
Hibernate, Standby