That would've been ValForth, printed in repro-blue ink on yellow paper. Hard as hell to read. It was a good package if you didn't mind coding for an hour and then sitting there swapping 5 or 6 diskettes as you hoped it would compile. It was the best FORTH package there was for the 800.
I don't quite follow. Are you referring to the indirect addressing which was used as a protection scheme (the hardest to bypass -- could take days to trace through), storing index and temp values on Page 0 (often trying to tie them into game-based counters like in Defender)?