Sartre says that existentialism leads one to recognize the human...

Sartre says that existentialism leads one to recognize the human condition as one of forlornness, anguish, and despair. What does he specifically mean by each of these? In terms of the notion of anguish, why would Sartre argue against the idea that absolute values exist? How does his position against the notion of absolute value lead Sartre to a very odd view of moral decision-making? How do we determine on his view what the right or good choice is? How is this different from the way in which we usually engage in moral investigation and choice?