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    1.5 Programming Considerations
      
     
    
      The major programming considerations are as follows:
    
      - 
        Keyboards are the greatest variable between different 
        manufacturer's workstations. If you want your program to be 
        portable, you should be particularly conservative here.
      
- 
        Many display systems have limited amounts of off-screen memory. If 
        you can, you should minimize use of pixmaps and backing store.
      
- 
        The user should have control of his screen real-estate. Therefore, 
        you should write your applications to react to window management, 
        rather than presume control of the entire screen. What you do inside 
        of your top level window, however, is up to your application.
      
- 
        Coordinates and sizes in X are actually 16-bit quantities. They 
        usually are declared as an 
        int16 in the functions. Values larger than 16 bits can be 
        truncated silently. Sizes (width and height) are unsigned quantities.
      
- 
        The types color, colormap, cursor, display, font, gcontext, pixmap, screen, and window are defined 
        solely by a functional interface. Even though they are treated like 
        structures in this document, it is not specified whether they are 
        implemented as structures or classes. Although some interfaces are 
        described as functions, they are not required to be defined using 
        defun. (It is a requirement that they be functions as opposed to 
        macros or special forms.)
    
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