The contract in plain language.

US dollar contracts on the Nifty 50, traded on NSE IX in GIFT City. $2 times the index, tick $0.5, cash settled. Monthly expiries (three months out) plus quarterlies, all on the last Thursday. Options: weekly, monthly, quarterly, European style.
NSE IX lists futures and options on four indices: Nifty 50, Nifty Bank, Nifty Financial Services and Nifty IT.
Indian residents: IFSC-registered brokers under LRS. Foreign investors: FPI route or an IFSC broker. Your broker's IFSC onboarding document beats any blog, including mine.
No. NSE futures are rupee contracts onshore; GIFT Nifty is a dollar contract on an international exchange, open nearly 21 hours a day.
It opens at 6:30 AM and absorbs overnight global news before the onshore open.
NSE IX contract specification circulars on nseix.com. Timings and calendars can change by circular.