There are many times in which one must switch Windows user accounts without logging off. For instance, changing users so that one may gain power and access to the files and folders on another account. However the best thing about this ability is its versatility. When one uses this method to switch users, programs (except for explorer.exe) that are running in the desktop, for instance Firefox or a Game, do not have to close. Basically, changing users with this will allow the main programs to still run during the switch. This can be quite handy. BTW, this is not a hacking tool. One still requires the password of the account that one is switching to…

How to switch user accounts without closing programs using the command prompt:

1. Quit explorer.exe
2. Open Command Prompt
3. Navigate to C:WINDOWSsystem32
4. Enter the following command: runas /user:*computer name*account name explorer.exe

Source: Switch user accounts from the Command Prompt [Life Hacker]

For educational purposes only! These set of instructions on instructables.com tell of a way to crack windows passwords. You know, the log in password of your neighbor- no I mean the password that you, um, lost the other day… Basically, it uses a Linux distro (Slax, I believe) with its special software. The software is called Ophcrack, which is part of this Linux distro. The cd itself is a live cd which means you boot up with it. After boot, the applications in this cd automatically scans your computer for passwords of log in accounts (SAM Files) and then displays them for you. This means that you do not have to reset any passwords. You can actually view the old password that you… lost… This should be very helpful whenever you loose your password because we just happen to loose our windows account log in passwords all the time

Link Source: Cracking Windows Passwords [Instructables]