Are all the system variables "%(nn)" read-only? It /appears/ that way, but I wanted to know for sure. (When I make an assignment like "%(1) = 24.0625", the contents of %(1) don't change to reflect the assignment)

In the v3.8.50 client, The "List Current Variables" command lists quite a number of things. Where is the software reading these from, or are they hard-coded constants in the software?

Thanks all!