Good questions, indeed. I will answer them one by one.
P.O.P. :
Friend!
Because of man's sin, he does not have peace. Man's redemption from sin will give him peace. But man needs a Redeemer. So, God's Son became a Redeemer and died as a holy sacrifice for our sins, so that He may redeem us. Because of His sacrifice, you can be redeemed and can have Peace. So, He is the Prince of Peace.
Man can try hard to do several things.
But he cannot make Peace. But God can and He did make Peace for us.
"God made Peace through His Son's death" (Col. 1 : 20).
K.O.K. :
Who is it? The very same Prince of Peace. Yes, He is not only PRINCE. He is also KING.
But He is the KING of ALL the Kings.
SAVIOUR :
As He is God's Son, He Himself is God. He came into this world in human form in order to become a ransom for us by shedding His precious and sinless blood, which alone can bring us forgiveness. He died in our place and has become our Saviour.
Are you searching for Peace?
He can give you peace.
He can save you from your sins.
He can deliver you from your troubles.
He can solve your problems.
He can meet your needs.
COMING KING :
He came as Saviour. He will come as King.
As our Saviour He died on behalf of us.
Though He died, He became alive on the third day and has gone back to Heaven.
He is living even now.
He is going to return to this earth 
to rule as King of all Kings.
So....
P.O.P.
He is PRINCE OF PEACE as well as KING OF KINGS.
K.O.K.
He is SAVIOUR as well as COMING KING.
You may ask me, "What can He do for me?"
Whoever you may be, Friend, what He did to others, the same He can do for you.
Just click the question below to open the next page.
You will know what He did to others.
What the Prince Of Peace / King Of Kings did?
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Visit this site next month with your friends. You will read some more news.
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By the way, I will meet you now in the next page. - Jeyaraj
Hello
E-mail address is: revjeyaraj@yahoo.co.in 
(please mention your E-mail address while you send me your E-mail letter).
Do you know what is p.o.p.?
you got it, it is King of Kings.