I found an excellent "getting Started" type tutorial on-line at the following URL:

http://www.thiel.edu/Mathproject/CalculatorLessons/Default.htm

Interestingly, the first sentence in Lesson 1, "Introduction and Basic Operations" is 'In Calculus I and in almost all higher math courses students are REQUIRED [emphasis mine] to have an HP50g calculator.' I think this is the first instance I have seen of specifically HP calculators being the required calculator for use at any university! The tutorial also recommends strongly the learning and use of RPN! Be still my beating heart!