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BCS provides mechanisms to enable experienced users, developers, and business unit IT professionals to do the following much more easily: Reveal external data from enterprise applications, web services, and OData services in SharePoint and in rich-client Office applications.
Creating an authenticated ClientContext object is a multistep process. First, the user must be able to sign into the remote system interactively. First, the user signs into SharePoint through the federated authentication provider, and SharePoint must issue its authentication cookies.
Microsoft introduced support for calling web services in Workflow Manager using the new Call HTTP Web Service action in SharePoint Designer 2013. Workflow Manager also introduced support for creating structures to submit to web services as well as consuming their responses using the Dictionary variable type.
How does claims based authentication work in SharePoint?
Fundamentally, the forms-based mechanism was designed to authenticate against local users, that is, it was not designed to authenticate identity based on a federated system. SharePoint 2010 addressed this by adding direct support for claims-based authentication.
How does the SharePoint calendar work in SharePoint?
Behind the scenes, SharePoint Calendar is a SharePoint list, with rows for events and columns (Event Title, Location, Start Date, End Date, etc.) for metadata. Can roll up (aggregate) up to 10 calendars from other sites/calendars and display on the same screen (instructions here)
The external data column enables users to add data from external content types to standard SharePoint lists. Just like an external list, external data columns can display data from any external content type that is modeled in Business Connectivity Services (BCS).
Another option to track milestones and dates is via a Task List. Each and every Task List has a built-in view called Calendar. So in case you are tracking, say, project milestones via a Task List, you can easily visualize the tasks using the Calendar view (without a need to recreate the same milestones on a separate calendar).