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 Static overlays
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 Static overlaying of code is the traditional method of overlaying which has
 been superseded in recent times by dynamic overlaying. A static overlay
 linker usually reserves a space in the root of the executable within which
 the overlays will be loaded and executed. The size of the space reserved
 within the program image is determined by the overlay structure designed by
 the programmer, and the size of the modules making up the largest overlay
 section. A significant amount of memory can be wasted if one of the overlays
 is larger than the others. Each overlay section consists of one or more .OBJ
 files. Overlays may be grouped into areas or nested within one another,
 further complicating the overlay structure.