It generates an error if no such atom exists. Top-level windows are returned as children of their logical parents. Returns the window containing the point given by rootX and rootY . If no window in this application contains the point then an empty string is returned. In selecting the containing window, children are given higher priority than parents and among siblings the highest one in the stacking order is chosen.
All dimensions are in pixels.
The name is usually the name of the method for the geometry manager, such as pack or place . If the geometry manager is a widget, such as canvases or text, the name is the widget's class command, such as canvas . Id must be a decimal, hexadecimal, or octal integer and must correspond to a window in the invoking application. If a virtual root window is in use on the screen, the position is measured in the virtual root. If a virtual root window is in use on the screen, the position is computed in the virtual root.