using a built-in keyboard as a seond keyboard
complete
M
MouseMux
complete
M
MouseMux
That should already work, if you attach a 2nd keyboard to your laptop and select either switched mode with multi keyboard enabled, or multiplex mode - then you can with a different mouse click on a window and the mapped keyboard will only type in that window, so simultaneous typing in two windows with two keyboards will already work. Let me know how it goes!