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Thanks for your request. MS Word document is flow document and does not contain any information about its layout into lines and pages. So there is no way to determine where page starts or ends.
In Aspose.Words we use our own Rendering Engine, which layouts Word document into pages. This rendering engine is used to convert documents to fixed page formats like PDF, XPS and images.
In one of future versions, we are going to expose information of nodes layout. This will help you determine on which page and where on the page the particular node is located. I will notify you as soon as this feature is supported.