As I trace the evolution of the LAST X capability introduced in the Classic series (65?), I can see how it slowly evolved to become the RECALL ARGUMENTS in the 48GX. It had become very useful for those functions which require multiple input variables on the stack.
However, when I studied the HP 49G+, I was unable to find such a function. There is an UNDO, but it also erases the previous results.
Am I missing something here?