Questions About EmptyMovieClip

[COLOR=#000000]i am confused about this code [/COLOR]

[COLOR=#000000]var[/COLOR] mc = [COLOR=#0000ff]_root[/COLOR].[COLOR=#0000ff]createEmptyMovieClip[/COLOR][COLOR=#000000]([/COLOR][COLOR=#ff0000]“container”[/COLOR], [COLOR=#000080]50[/COLOR][COLOR=#000000])[/COLOR];
means that the empty mc will be on the root or on the level 50?
Thank you