This page lets you customize how publication settings and user preferences are stored on the end user’s computer.
As ISBN identifies books, the publication GUID allows the ebook / publication to store its settings on the end user’s computer (see below). To generate a new GUID, you can press the right button.
Note that you should not change a GUID once your project is started.
If you want to share the same settings between different publications, give them the same GUID.
Dedicated topic about portable publications and ebooks
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