Keyword to set both the X and Y position in one switch. N can either be an integer or a real number. If N is an integer it is a pixel value, if N is real it should be
normalized (ie between 0.0 and 1.0) as it is multiplied by the width
or the height of the screen. Affects text as well as graphics (as do <x> and <y> but not <bmp> which only affect graphics).
By default X and Y determine the coordinates of the top left corner of the displayed item, see <XYJustification>.