Compiler Linker Loader Question:

In IBM mainframe environments such as OS/360 this type of program is known as a linkage editor. However, a linkage editor, as the name implies, had the additional capability of allowing the addition, replacement, and/or deletion of individual program sections. Operating systems such as OS/360 had a different format for executable load-modules, in that they contained supplementary data about the component sections of a program, so that an individual program section could be replaced, and other parts of the program updated so that relocatable addresses and other such references could be corrected by the linkage editor, as part of the process.