You have to use control + s only. but if you want to save it in different format, use control + shift + S
I think the answer is The PPP (Point-to-Point Protocol). <em />
It is the most common type of protocol that people use using a modem, a device or a router to have an internet connection. Here there two systems that establish a link to each other which is the point to point. The bits are transferred to a sender and a receiver.
