Connect locally to second user login from first session

Hi folks,
just wonder if it’s possible to do this:

  • I have user a and b on my Plasma or Gnome machine
  • I am logged in with user a
  • I don’t want to use switch user
  • I want to log in the second user and see the screen like from remote session

Is it possible to use remote desktop tool like krdc for this. I’d like to see /use second user without switching completely. You know what I mean?!

Thanks for ideas!!