emacs (v.26.3) can distinguish, out of the box, C-M-v (scroll-other-window) and C-M-S-v (scroll-other-window-down).
On the other hand,
emacs -nw, when run in either
xterm, translates C-M-S-v to C-M-v, even when I explicitly set the former.
(Also, as a side note,
xterm demands I use
ESC rather than the "Alt" key, which is actually "Meta". Bonus question: why?)
Anyone know how I can deal with this?