Question: Operands of Procedures

I just recently learned that the fourth operand of a maple procedure is it's memory table. However, I'm confused about being able to identify the other operands, primarily the first three, if I was to see a written procedure for example and determine what they are. For example is the first operand the argument used in the procedure ? The 2nd argument, any local or global declared variables ? The 3rd argument, any option settings ? Also if the procedure body is basically instructions for the procedure, then what is the description part of a procedure definition ? Dan
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