New
#61
I'm not exactly sure what you're asking, but I'll answer it this way -- Apple has an app called MESSAGES that lives on your computer. It is essentially just like the one on the iPhone -- and they are in sync. So suppose you're at your computer and someone texts you from your phone SMS. There's no need to pick up the iPhone and reply. You can use your Mac to do so.
Even cooler (but kinda weird) is suppose you're upstairs in your house but you left your iPhone downstairs. Or in the car. Or at work. Your Mac will see the incoming call and give you a chance to answer it. So any Mac you have is like an 'extension' of your iPhone.