Nope :P
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To log in to the game you use the same username and password you used to buy the game at the Minecraft website. If you have migrated your account to a Mojang account, use that email address and password.
Yes and no.Only if the device is the same family as the original account. If you have a computer Minecraft account and want to play Minecraft on an X-Box you won't be able to.X-box Minecraft accounts will not work on an iOS Minecraft account, etc.You still need to buy seperate iOS, Android, X-Box, Playstation and Computer games/accounts. (Mac, Windows and Linux can use the same account tho.)
You can't, sorry.
You can log into the Minecraft launcher on one PC with as many accounts as you want. You can also install as many as you want on each computer you have. However your saved games are not syced between PCs. On the same PC though, each launcher will still be able to access the same saved worlds.
same place as everywhere else from the minecraft website