If i'm not wrong.
Teamviewer is onlu helpful for remote access.
So you need IP And password
ID and Pass, not IP.
You don't even need to sign up btw.
Lets say you need help with something, you give your ID and Password to someone with TeamViewer. You then open the program, waiting for the person to access your computer. They can then request remote assistance, which gives you the choice to let them control your mouse. At any time, you can close the program, instantly stopping them from accessing your PC. When each session is complete, your password will usually change. If not, you can right click, and go to change password.
Thats basically it. Goes the same way if you want to help someone.
Also, you can do things like present your PC by clicking the presentation tab.
Can also send files by clicking file transfer.
1. It's not an IP
2. There is something called Teamviewer Accounts and you can add the person to your friends list so you dont have to be talking to them to get there passcode. Just request a presentation etc