http://blogs.msdn.com/b/officeapps/archive/2012/11/28/developing-an-sharepoint-2013-autohosted-app-with-admin-on-behalf-bcs-subscription.aspxIntroduction to BCS events Until SharePoint 2010, Business Connectivity Services (BCS) was all about “pull,” that is, users needed to “refresh” the data from a SharePoint site in order to fetch the latest data records from the external system. With SharePointen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/officeapps/archive/2012/11/28/developing-an-sharepoint-2013-autohosted-app-with-admin-on-behalf-bcs-subscription.aspx#10395167Tue, 19 Feb 2013 13:06:08 GMT91d46819-8472-40ad-a661-2c78acb4018c:10395167Sabarivel<p>Hi,</p> <p>Could you brief about invoking external system to send notification whenever a change happens in its database?</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10395167" width="1" height="1">