The NextPage client application and service work by creating a set of metadata for each master document an author creates, including a unique identifier. Only the metadata, and not the entire document, is sent through the service for identification as the document is modified and saved. This approach provides document creators with real-time alerting any time a document is saved, in much the same way Outlook notifies users of new e-mail.
While easy to use, the first commercial release of NextPage's namesake application and service lacks the rich change-tracking capabilities of rival Workshare.
Application Modernization: What Is It and How to Get Started