In racket/gui, how can I tell if I am on wayland or x11 besides taking a peek at $WAYLAND_DISPLAY

Same sort of method: Look at $XDG_SESSION_TYPE. https://unix.stackexchange.com/questions/202891/how-to-know-whether-wayland-or-x11-is-being-used

Maybe this is what you are after?

https://github.com/racket/gui/blob/ff12969d6a99601f8317f869fcf2f54efa838229/gui-lib/mred/private/wx/gtk/queue.rkt#L118

Yes, I just found that. Thanks!

I have three monitors, when I run slideshow -M n myslide.rkt (n = 0, 1, 2), is the slideshow window expected to pop up on the first, second or third display respectively?

This maybe seem a dump question, how can I make a mad/rage face (analogous to :rage:) using pict/face?

nvm, found it