Chain loading is a method used by computer programs to replace the currently executing program with a new program, using a common data area (a so-called core common 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. Like the use of overlays, the use of chain loading increases the I/O load of an application. Unlike overlays, however, chain loading replaces the currently executing program in its entirety. Overlays usually replace only a portion of the running program.
Read more about Chain Loading: Chain Loading in Boot Manager Programs, Chain Loading in Unix, Chain Loading in BASIC Programs
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