🚀 go-pugleaf

>  What tty name can be used to specify that [a simulated input] character
>  should go the the
>  xterm window in which the mouse cursor is located?  /dev/ttyp? and /dev/ttyv0
>  obviously focus the input to a specific window regardless of the mouse cursor
>  location.

Simulating keyboard input for windows becomes trivial in version 11 and can
be done in an os-independent fashion (i.e. no ioctl()'s).  'Till then,
you'll have to kludge something using the fact that xterm stores it's window
id in the environment.  The shell thus has sufficient information to relate
window id and pty, which it can store somewhere for you to find in your
application.

-rrs