Page 675 My job queue NAV 2016

Hi Folks -

 

In page 675 My job queue there is a pingpong on the group level on the page and there are 2 control add-ins created. 

PingPong::AddInReady()
PingPong::Pong()
 
Can someone please tell me how these 2 controladdin functions are created. 
 
Any help is highly appreciated.
 
 
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