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Chain loading
Chain loading is a method used by computer programs to replace the currently executing program with a new program, using a common data area, to pass information from the current program to the new program. It occurs in several areas of computing.
Chain loading is similar to the use of overlays. Unlike overlays, however, chain loading replaces the currently executing program in its entirety. Overlays usually replace only a portion of the running program. Like the use of overlays, the use of chain loading increases the I/O load of an application.
== Chain loading in boot manager programs ==
In operating system boot manager programs, chain loading is used to pass control from the boot manager to a boot sector. The target boot sector is loaded in from disk, replacing the in-memory boot sector from which the boot manager itself was bootstrapped, and executed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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