WindOpen() opens a window on screen and replaces the AES open_wind() function. In WinDom environnement, the open_wind() should never be used (except some very special case).
An opened window has its status WS_OPEN bit set to 1 (i.e. the status field of the WINDOW structure). If the status WS_GROW bit is set to 1, a graphic effect should be used (via graf_growbox() function).
It is possible to give to the x and y parameter a -1 value. In this case, the window will be horizontally centered (x=-1) or vertically centered (y=-1) or both. WindOpe() calls GrectCenter() to performe that.
A window can have minimum and maximal size : just sets the min_w, min_h, max_w, max_h fields of the window descriptor.