Can anyone tell me the name of this routine?There are four cards.
There are two split cards (King of Hearts/King of Diamonds) (King of Spades/King of Clubs)
And the other two are double back cards.
I inherited this from a friend and know how to do it.

That should read "don't know how to do it"

Greetings Bob;
That sounds like Parade of the Kings, I will PM you with the set up.

All the Best
Marty