What do you mean by RTS/CTS in NTS?
I'm guessing he means the handshake protocols where the sender asks the receiver if he's ready to receive, and doesn't send until he gets confirmation.
NTS also has some rudimentary error-detection/correction built in:
The sender will tell the receiver how many words are in the message. If the receiver does't get the exact number of words or if he has any other reason to think the message wasn't properly received, he will notify the sender and they will try again. If the word count matches and the receiver doesn't believe there are any errors, he will tell the sender that the message was received.
If the sender does NOT receive that final confirmation, he will assume the message was not sent and will try sending it again either right then or later.