Integrating web based Dicom viewer with Orthanc

What is the easiest web based dicom viewer to integrate with orthanc windows without container to be used on local network?

The following FAQ in the Orthanc Book should answer your question:
https://book.orthanc-server.com/faq/viewers.html

Summarizing, check out the “Stone Web viewer plugin” that is part of the Windows installers by Osimis.