If its a computer then yes.
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Minecraft.net download from there
you have to download it from your computer
Yes you can, but you need to download minecraft for macs
It will while the program is running, but after it stops running there will be no change in computer speed.
What do you mean by this? If you simply mean have minecraft on more then one computer then of course you can. As long as you have a valid account you can download minecraft onto any computer.