I am not leaving the SharePoint community.  I still feel very strongly and very proud to be involved with such a wonderful product and I intend to continue my involvement with it.

What is Reimagine SharePoint Development?  https://www.reimageinespdev.com  It is about re-thinking your existing SharePoint solutions into apps for SharePoint.  Apps for SharePoint offer a lot of advantages over SharePoint solutions.  I remember when I was in MCS working on SharePoint solutions and the amount of work involved in testing new SharePoint solutions not only with the SharePoint but also testing how other SharePoint solutions on the same farm could potentially impact each other.  Apps inherit isolation, removes those types of concerns. This is just one advantage of apps for SharePoint. Join me on 5/20/2013 on https://channel9.msdn.com as we kick off a new series on Channel 9 and MSDN where we show you not only the advantages od apps, but how you can start migrating your solutions today.  I welcome your feedback as this content is for you. 

You can do it using an app event receiver and code. An app event receiver allows you to create events that can execute code when an app is installed, uninstalled and upgraded. In visual studio selecting the app project will allow you to see the properties in the properties window.  There are three properties that by default are set to false.  "Handle App Install", "Handle App Uninstall" and Handle App Upgrade", selecting true to any one of these properties will create a class in your web project that can receive the event.  The class inherits from IRemoteEventService much like a normal event receiver.  In the ProcessEvent method you can then execute any code you like. For instance the sample below.  I am activating the Push Notification feature which supports managing subscribers for push notifications for mobile devices.

public SPRemoteEventResult ProcessEvent(SPRemoteEventProperties properties)

{

      SPRemoteEventResult result = newSPRemoteEventResult();

      using (ClientContext clientContext = TokenHelper.CreateAppEventClientContext(properties, false))

      {

              if (clientContext != null)

               {

                       //Add Push Notification Feature to HostWeb

                      clientContext.Web.Features.Add(

                               new Guid("41e1d4bf-b1a2-47f7-ab80-d5d6cbba3092"),

                               true, FeatureDefinitionScope.None);

                      clientContext.ExecuteQuery();

               }

       }

}

In the above sample you will notice the TokenHelper.CreateAppEventClientContext method.  The second parameter takes a Boolean value that determines if it should create the ClientContext for the host web or the app web.  Be default, its set to false which created the ClientContext for host web. 

You can also create remote event receivers similar to the sample below:

var list = clientContext.Web.Lists.GetByTitle("MyAnnouncements");

var requestProperty = (HttpRequestMessageProperty)

      OperationContext.Current.IncomingMessageProperties[HttpRequestMessageProperty.Name];

var appWebUrl = "https://" + requestProperty.Headers[HttpRequestHeader.Host];

var eventReceiver = new EventReceiverDefinitionCreationInformation();

eventReceiver.EventType = EventReceiverType.ItemAdding;

eventReceiver.ReceiverName = "AddAnnouncement";

eventReceiver.ReceiverUrl = appWebUrl;

eventReceiver.SequenceNumber = 10000;

list.EventReceivers.Add(eventReceiver);

clientContext.ExecuteQuery();

Remote event receivers are a pretty powerful addition to SharePoint 2013. You can not only affect changes in the app web, but you can also make affect changes in the host web as well.  One thing to note, anything you want to access whether it is read or write in the host web requires you to set the app permissions to perform those actions

https://sharepoint.microsoft.com/blog/Pages/BlogPost.aspx?pID=988

https://msdn.microsoft.com/en-us/library/hh237664.aspx

So the next question is, how does one get started in creating composite solutions. Well I have compiled some, what I think, are valuable resources to help kick start your endeavor into the world of no-code applications.

Microsoft Links

• SharePoint Designer How-To's on Office.com - https://office.microsoft.com/en-us/sharepoint-designer-help/
• TechNet resources on Business Connectivity Services - https://technet.microsoft.com/en-us/sharepoint/ee518675.aspx
• TechNet resources on Workflow - https://technet.microsoft.com/en-us/sharepoint/ff819861.aspx

Books

• "Beginning SharePoint Designer 2010" by Woodrow W. Windischman, Bryan Phillips, Asif Rehmani and Marcy Kellar is a great source of information on famaliarizing yourself with SharePoint Designer 2010 and all that it can do for you. It does a great job of explaining SharePoint Workflows.
  • The book can be found here - https://www.amazon.com/Beginning-SharePoint-Designer-Woodrow-Windischman/dp/0470643161/ref=cm_cr_pr_product_top
• "Microsoft SharePoint Designer 2010 Step-By-Step" by Penelope Coventry is another great book that walks you through the steps to perform specific tasks with SharePoint Designer.
  • The book can be found here - https://www.amazon.com/Microsoft-SharePoint-Designer-2010-Step/dp/0735627339/ref=sr_1_2?s=books&ie=UTF8&qid=1301001221&sr=1-2
• "Enterprise Application Development in SharePoint 2010 - Creating an End-to-End Application without Code" by Ira Fuchs is a great resource for learning how to build a no-code application from end-to-end. In this book, you will build an Employee Absence Tracking application from the ground up. The book goes over step-by-step and walks you through the process.
  • The book can be found here - https://www.amazon.com/Enterprise-Application-Development-SharePoint-2010/dp/1450754171/ref=sr_1_1?ie=UTF8&s=books&qid=1301000877&sr=8-1