InfraWorks is not needed to collaborate on Shared Views. All collaborators can view the Shared View and add comments online.
To begin collaboration, go to the link provided by the person requesting your collaboration.
The Shared View displays in Autodesk Viewer.
Use the tools within Autodesk Viewer to comment on and view the Shared View.
When you comment, the person who created the Shared View receives an email notification.