Proctoring means supervision. Remote proctoring is a decentralized exam-delivery system with virtual supervision. Many candidates take an exam simultaneously from different remote locations (including their own homes) and a proctoring service provider confirms the identity of candidates and monitors any dishonest behavior during the exam by video surveillance. This ensures the integrity of the process.
Since the NPPE exam is remotely proctored, that means that it is delivered remotely and you can take the exam from the comfort of your home, wherever in the world it is located. What you need though is a computer, a webcam, and a fast internet connection.