Hi Shiva,
I don't understand the question. do you need this information?
http://msdn.microsoft.com/en-us/library/gg327941.aspx
http://www.vifopex.com/dynamics-crm-2011-event-execution-pipeline/
http://mscrmtools.blogspot.ch/2011/01/crm-2011-plugins-welcome-to.html
Thanks
Alessandro
Alessandro Graps