is it cheating to look in previous games of yourself and use that knowledge in your current game ?

is it cheating to use a table of chances of 2 dice (as i know some people in backgammon, although you can easily do that in your mind as well)

would it be cheating to have a chessboard next to your computer, setup the game you are playing, and test-play several moves ahead ?

is it cheating to use notes ?

all this can be considered using outside 'programs'