Access RPN stack result in PPL program?

[John R. Graham]

(09-04-2014 10:26 PM)gbh Wrote:  How do I access the value in the lowest level of the RPN stack (x, level 1) in a PPL program?
...

There is some access through the PPL function parameter and return value mechanisms. For example,

Code:

EXPORT ADD2(X,Y)
BEGIN
  RETURN X+Y;
END;

This program pops two values off of the stack, which end up in the variables X and Y, operates on those variables and returns the result, which is then pushed back onto the stack.

However, there's no ability to arbitrarily manipulate the stack outside the parameter / return mechanism. This is a capability I would sorely like to be added to the Prime: the stack needs to be a first-class citizen across the calculator.

- John