with at least two windows open, i often have trouble to find the
active one, ie. the one where the curser is ready to accept commands.
so i want eg. the modeline swap fore- and background colors or parts
of it. my older versions (this is a GNU Emacs 21.3.1
(i386-unknown-freebsd4.8, X toolkit, Xaw3d scroll bars)) did this
without any extra elisp.
i couldn't find a ready-made function, so my question continues with
"is there a hook called on each `other-window'"? i think i could take
it from there with the elisp snippets already collected :)