Required 

aq: 

Windows should follow Common Desktop Environment window management functionality conventions, as shown in Table 10-2. 

Primary windows should provide Close, Move, Lower, and Minimize as the minimum set of capabilities. They should allow Resize and Maximize as appropriate. Secondary windows should be designed so that resizing and maximizing are neither necessary nor appropriate. Most secondary windows should only include the Close, Move, and Lower capabilities. In extraordinary cases, a secondary window may provide the Resize and Maximize capabilities. Secondary windows do not provide Minimize capability - they are minimized with the associated primary window. 

Required 

as: 

Windows that have form factor constraints need to set Window Manager hints for minimum size, maximum size, aspect ratio, and resize increment as appropriate. 

Required 

at: 

Maximizing a window should show more content (objects or controls) if appropriate (as opposed to scaling up the sizes of objects and controls). 

Required 

au: 

Windows that have Close or Exit functionality need to support the window management protocol for Close if there is a window menu. In the case of dialog boxes, the Close item on the window menu corresponds to the Cancel functionality or dialog box dismissal with no further action taken.