This thread will help you to Hack anyone just knowing his/her IP address, and you can learn many things such as , How to use it , How to hack it and some other simple DOS commands that will be useful to you.
2).NETBIOS also known as NBTSTAT
This is a program run on the Windows system and is used for identifying a remote network or computer for file sharing enabled. We can expoit systems using this method. It may be old but on home pc's sometimes it still works great. You can use it on your friend at home or something.