how to start bussiness logic on server side

hi
i'v seen the mmo demo, but i didn't find what i need ;
as topic , i want to find where is bussiness logic thread, i want an "update" func , with which i can write AI , move Function, they all need a delta time ; so is there a simple AI or server side move function Demo; or how can i start

i don't know if i express clearly , sorry for my poor english;