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Is there a hotkey to move the 3D Cursor back to X=0 Y=0 Z=0?
Use Shift + S and then "Cursor to center".
Or you can use use a direct hotkey Shift+C.
You can also use the right panel to set the position manually (bottom right of the picture) :
Cursor to World Origin
Shift + S
To move the 3D Cursor back to X=0 Y=0 Z=0 you may use the Shift+C shortcut.
File --> User Preferences --> Input -->
Name for 3d View command is 'Snap Cursor to Center'.
There in it can be changed to what ever.
Mine is set to 'P' since I don't use the Game Engine.