Assorted WP-34S beginner questions

[Dave Britten]

Got a few questions I haven't been able to answer either via the manual or just plain old poking and prodding...

1. I've seen some programs that do STO I, STO K, etc. Those don't seem to correspond to stack registers. What are these alphabetic register names exactly?

2. Can I call LocR again from within the same program to dynamically increase/decrease the current number of locals?

3. What flags have special meanings, and what are they? As far as I can tell, the numbered flags are all for user-defined purposes, but there are alphabetic ones too.

4. Somehow I managed to crash program execution and when I hit P/R, I appeared to be browsing around the XROM code (the step number was reported as 'Error 037' or whatever the number happened to be). Is there a way to get in there deliberately (and safely) to examine routines?