Is there any way to have Vim react to a notification from another process?

I'm trying to figure out a way to show some kind of alert inside Vim
that is not triggered by a keypress from the user (CursorMoved or
CursorHold), but by some notification from the environment that Vim is
running is.

Is there any way to do this, or is this just impossible?

For example, the elinks program can update based on notifications from
another process. I wonder if Vim has this capability via VimScript.

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