Remote Event Receivers Basics

Overview:  Historically we use Full Trust Code (FTC) within SharePoint 2010 and MOSS to have the ability to handle events in SharePoint such as an item being added to a list.  Since SP 2013 and going forward, full trust code is not the preferred approach and Microsoft of Remote Event Receivers (RER).

Notes:

1. RER are web services that implement the iRemoteEventReceiver interface and a remote web server (WS). RER's WS can be hosted on an IIS application server (including Azure).
2. Asynchronous events supported with different code approaches: 1. Synchronously call on the before and after events i.e. ItemUpdating, ItemUpdated 2. Asynchronous on past event/-ed events i.e. ItemUpdating only.
3. RER's can be fired on SP events such as list item changes, BCS events, 

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