Appropriate way to quit Tkinter

[mzdude]

I've just started playing with Python. Installed 2.5 on Windows XP
system. I'm working through some of the examples in Programming Python
3ed by Mark Lutz. Given the following example when the Quit All button
action is assigned to root.quit the windows aren't dismissed or
destroyed. The application appears to terminate, but the windows
remain. When the action is assigned to root.destroy, the windows are
closed. Questions:
1) Which way is preferred / correct?
2) Is something wrong with 2.5? (I haven't tried older versions of
python)
3) Is there something wrong with my installation?


#############################################################################
# popup three new window, with style
# destroy() kills one window, quit() kills all windows and app;
top-level
# windows have title, icon, iconify/deiconify and protocol for wm
events;
# there always is an app root window, whether by default or created as
an
# explicit Tk() object; all top-level windows are containers, but never

# packed/gridded; Toplevel is like frame, but new window, and can have
menu;
#############################################################################

from Tkinter import *
root = Tk()     # explicit root

trees = [('The Larch!',          'light blue'),
         ('The Pine!',           'light green'),
         ('The Giant Redwood!',  'red')]

for (tree, color) in trees:
    win = Toplevel(root)
# new window
    win.title('Sing...')
   # set border
    win.protocol('WM_DELETE_WINDOW', lambda:0)   # ignore close
    win.iconbitmap('py-blue-trans-out.ico')            # not red Tk

    msg = Button(win, text=tree, command=win.destroy)   # kills one win
    msg.pack(expand=YES, fill=BOTH)
    msg.config(padx=10, pady=10, bd=10, relief=RAISED)
    msg.config(bg='black', fg=color, font=('times', 30, 'bold italic'))

root.title('Lumberjack demo')
Label(root, text='Main window', width=30).pack()
#Button(root, text='Quit All', command=root.quit).pack()      # kills
all app
Button(root, text='Quit All', command=root.destroy).pack()  # kills all
app
root.mainloop()