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They move web browsing beyond the limitation of viewing one document at a time, allowing the browser to be split into several windows, each displaying a different document. The major material in the proposed PBE collection is information about individuals that lived in the early part of the Byzantine Empire. There is information still extent about 7000 of them. Because there are so many individuals, part of the materials to be published are indexes of various kinds that will make it possible to locate individuals of interest. In the example above, we have used the Index of Names to locate one of them, Narses 3 .