Re: "Free" nodes with TikZ on beamer slides?

Thanks Jon for this example :
 
 http://www.nabble.com/%22Free%22-nodes-with-TikZ-on-beamer-slides--tf1590097.html#a4318958
 
 But I'm surprised there is no other way to produce arrows going from a word (or whatever) to another, as if there is a change (say, you forgot a letter), you have to re-draw the grid, re-measure the exact position etc... and it seems to be something quite classical for a presentation!
 Isn't there a way to make latex remember the position of a point, even if the point is defined inside a tikzpicture and used outside it?

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