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HES organized data into two main types: links and branching text. The branching text could automatically be arranged into menus and a point within a given area could also have an assigned name, called a label, and be accessed later by that name from the screen. Although HES pioneered many modern hypertext concepts, its emphasis was on text formatting and printing.
HES ran on an [[IBM System/360 Model 50]] [[mainframe computer]], which was inefficient for the processing power required by the system. The program was used by [[NASA]]'s Houston Manned Spacecraft Center for documentation on the [[Apollo program|Apollo]] space program.<ref>van Dam, Andries. (1988, July). [http://www.cs.brown.edu/memex/HT_87_Keynote_Address.html Hypertext '87 keynote address]. ''[[Communications of the ACM]]'', 31, 887–895.</ref> The project's research was funded by [[IBM]] but the program was stopped around 1969, and replaced by the [[File Retrieval and Editing System|FRESS]] (File Retrieval and Editing System) project.
== References ==
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