Simplified interactive graphical user interfaces for sorting through a stack of overlapping windows on a display in order along the Z (depth) axis

An implementation to simplify GUI display interfaces having stacks of overlapping windows by enabling an interactive user to sort through the stacks of windows in a user friendly intuitive manner without resizing or moving any of the windows in the stack. A computer controlled interactive display system includes a stored hierarchy of windows that are displayable to overlap each other in a selected order to form a displayed stack of windows along the depth (Z) axis. An implementation for designating a starting window in said stack, and for displaying this starting window in focus. Then, scrolling along said Z axis from this starting window to thereby sequentially display subsequent windows in the stack in the selected order. After each of the sequentially displayed windows, an implementation for fading the starting or currently displayed window out of focus and after each fading out of the currently displayed window, for then bringing the next subsequent window into displayed focus.