subprocess.Popen spawning cmd shells

[Mrown]

Hi,
  I'm currently writing a python program that relies on a CLI
program.  What I'm currently doing is using subprocess.Popen on Python
2.5.1.  Here's the line that I'm currently running:

            child = subprocess.Popen(["c:\app.exe", node, "-w",
str(tmpTime * 1000), '-n', str(1), '-l'], stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)

The problem is that although the above works, a CMD shell is spawned
and becomes visible for each time I run the above.  I thought that by
redircting stdin, stdout and stderr, no CMD shell should pop-up.  Is
something wrong in the way I'm using subprocess?  Thanks for your help.