The Web Application Open Platform Interface Protocol (WOPI) defines a set of operations that enables a client to access and change files stored by a server. This allows the client to render files and provide file editing functionality for files stored by the server.

WOPI stands for Web Application Open Platform Interface. The WOPI Client api communicates with Office Web App server and displays data from documents stored in SharePoint.

https://msdn.microsoft.com/en-us/library/hh622722(v=office.12).aspx

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