Arduino IDE program to control 8253 Programmable interval timer

Haha Yes i have read that page before. It is not as straight forward seeming to me but it is also my first time diving into something like this so forgive me. I understand as a starter CS will set low, A0 A1 will be set low to select counter 0, WR will be set low while sending control works. But then the control word process is where i get lost.