- 
        bell,
        Function 
      
- 
        bit-gravity,
        Type 
      
- 
        bitmap, Type 
      
- 
        bitmap-format,
        Structure 
      
- 
        bitmap-image, Function
      
- 
        bits-per-pixel,
        Slot of
        pixmap-format 
      
- 
        bits-per-rgb,
        Slot of
        visual-info 
      
- 
        blue-mask,
        Slots of
        visual-info 
      
- 
        boolean,
        Type 
      
- 
        boole-constant,
        Type 
      
- 
        :button-press,
        Event Type 
      
- 
        :button-release,
        Event Type