They each have different ways of communicating. Meaning their protocols are different.
Protocols are the rules by which communication takes place in a system.
It specifies who talks to whom, what they can say to each other and how they can say it. The Macintosh uses AppleTalk protol. Therefore, the significance of my project was to broaden the lines of computer communication between the three different platforms. The question of what do you use to translate or exchange the protocols between the three also arises.