computers nowadays are in demand because it can easily communicate with each other and you can easily talk to your friend.
Chat with our AI personalities
You can use as many mods as you wish, as long as none of them conflict with the others. It would also depend on how much RAM your computer has, and how powerful your CPU is. That would be the hard limit. Most computers nowadays can handle about 5-8 mods before Minecraft just crashes.
In the computers control panel
nowadays
there is an app for everything nowadays...
People ON computers: Only if you are also on one. You don't game Cross-platform, usually. Computers, meaning AI's: Only for Firefight and the Campaign.