Hello Zetmolm.
This feature works as follow: you open for example 3 files and you don't close any of them. Laterly you may swicht from one to other only with a click. This is similar to a web navigator (ex Firefox) you open in diferents tabs differents url, and latterly you may change between them.
This feature is very important when you use the ereader for technical papers. In this cases normally you are simultaneouslly reading serveral files (books, articles, etc).
My old DR1000 had this feature.
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