title: Vbulletin plugin development tutorial
body: <p>I searched for tutorials but i didn't found any useful tutorial. I want to create simple plugin which add "123" to header of every pages of forum.</p>
  
  <p>I tried to go to admin panel -> create new plugin. But i don't know what hook i need to display "123" in header.</p>
  
  <p>I will be very thankful for any help.</p>