To get the current co-ordinates of the window position.
winio@('%gp', x, y)
integer x, y (output)
Grave accent (`) - used only in conjunction with %aw - Attach MDI Child Window in order to provide
co-ordinates that are relative to an enclosing MDI frame.
x and y are returned as the co-ordinates in pixels of the current
position in the window relative to the top left-hand corner (0,0) of the
window. These values can be used with %sp - Window Position.
%sp - Window Position