Shulchan Oruch Mishnah Berurah 128 (8)  implies that the Kohanim should go up to bless the people after the prayer leader has said "Retzei". I see that many knowledgeable Kohanim start going up ...
I recently saw some drawings of the Kohen's hands during duchaning, not the way I do it. I put my two first fingers together without leaving a window. I would like to know if there is any valid way ...