Frameless windows. There is no window that allows for a framless window or a window that will hide the frame within the wall. It is becoming a common detail in Architecture today and must be customised in ArchiCAD to show this correctly in 3D and Drawings.
Also windows should be able to be installed accross multiple walls - if there is a change in material at the window zone for exanple or if the windows is located within a curved and straight wall at the same time or two curved walls with the differing radiuses.