No. The Password Reset Key is aimed at Windows PCs. However I have had a number of people ask me this and it would be possible to create a key to do the same for Linux. If you would like to see this then send me a message. If enough people want this I can look at creating a new project to create a Linux version. It may even be possible to do this for a Mac but that would take a little more research.
Most organisations use Active Directory or a similar technology (LDAP) to manage users and passwords. This tool works on local accounts. So the answer is sort of. While the key does not affect the Domain account on the server it does work on local accounts. Once you have logged onto a machine with a Domain account it is cached locally and is seen by my tool as a local account. The tool will therefore reset the local account on that machine. If you go to another machine however you would still need to use your Domain password.
No, if you want a hacking tool to access machines that you shouldn't then head over to the darker side of the internet. This tool is for legitimate purposes and any account that has it's password reset will be immediately apparent to the legitimate owner. The disclaimer is very clear on the front screen every time you use the tool. There is a saying in the IT Security world "Physical access is complete access". If I am sitting in front of your PC then there are easy ways for me to access your data. You don't even need this key to do that.