the control the player no but to type on signs and titles yes.
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No, not on Minecraft PC. You just use your mouse and keyboard.
You don't use the keyboard. You need to Right Click on the mouse.
print screen key on keyboard, if you have steam, you can run minecraft from your library and use the steam screenshot system.
minecraft can use anywhere between 256 MB and 512MB of ram on any system.
No, mods are only available for the PC version of Minecraft. You can't run or use unauthorised data on an XBox 360, only things officially authorised by Microsoft.