Usage
Constructing an overlay program involves manually dividing a program into self-contained object code blocks called overlays laid out in a tree structure. Sibling segments, those at the same depth level, share the same memory, called overlay region or destination region. An overlay manager, either part of the operating system or part of the overlay program, loads the required overlay from external memory into its destination region when it is needed. Often linkers provide support for overlays.
Read more about this topic: Overlay (programming)
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