If anyone has access to a 'V' shaped dipping bar than the ability to do extra wide to very narrow dips (and anything in between) is present. This way you can find which hand position affects which body part the best, weither it be pecs, delts or triceps. And as suggested before, if some way you can do dips with the knuckles forward than a different influence is felt on the pecs. Can also do bench dips with a 'V' bar with the legs raised on a bench, box, etc.
If a pair of gymnstic rings are used than so much the better. A whole new slant on pec work as well as delt & triceps, will be offered. Just muscle up or use a high bench, ladder, etc, to get in the position of dipping. A great all around upper body exercise. Not used much these day's by BB'ers, don't know why.
Speaking of positions: I will have to agree with the exciting, endearing and always lovely Princess L. Kinesiology 101 is still a strong bases of any future study on human function, preformance and adaptability. Prime course in most schools. Except liberial art's colleges, but they don't count for much anyway (just my view). Good Luck.
Side Bar: Any position the lovely Princess L want's to take is OK with me.