This tab allows you change 4-dimension position of window.
X,Y,Z-order,parent. To get position press button "get rect", to set position, write down all rect parameters: left, right, top and bottom and then press "Set rect"
To chaghe z-order, press buttons "moove up" and "move down". You will see than handles in "prev" and "next" are changing. If "prev" is 0x00000000 it mean, that your window is in top of z-order(within its parent). Same way for "next".
To get parent window, press button get, and you will see handle of parent window in "Last" edit box. To change parent window, write it down in editbox "Parent" and then press "Set" button.