Would you be kind enough to advise if these are the same documents?
No legal advice. Use at your own risk.
Visa and Greencard Tracker
Visitor Medical Insurance for your visiting relatives.
No. But closely related.
Please read http://www.immihelp.com/visa-waiver-program/ and http://www.immihelp.com/esta/
where can I get a n I 94 for