you can network two laptops if you use a crossover network cable.
It will make a loud noise.
***********BOOM**************
Absolutely nothing.
they would be no ipods ipads macs so we would have to use other mp3s also another computors and laptops which is fine
a battery and a resistor connected together.
nothing would happen they would be fine
You would die.
We would have Facebook.
You would die.
They would grind together.
they break
All modern laptops would have the facility built in as standard. That is not to say that all previous laptops would be able to.