On Sat, 18 Sep 2021, Alyssa Ross wrote:
The nethack functionality was removed in 9109409 ("Remove nethack stuff"), but some remnants were (presumably accidentally) left behind in the documentation, documenting behaviour that no longer exists.
Ouch, I read this with a surprise that nethack mode got removed... but I can see it got removed in master 8 years ago, but it is still there in screen-v4. I personally use it and quite it a lot, although I am not a rougue or nethack player... But of course this should be applied to master for consistency