Tkinter window at the bottom all the time
There is not strictly a way to make a Tk window always underneath others. If your aim is to have a Tk application which cannot be seen, then you could achieve it by modiying the alpha value of the root window:
from tkinter import *root = Tk()root.attributes('-alpha', 0)root.mainloop()As this window is transparent, you could think of it as always underneath.