python executing windows exe

[Kiran]

Hi everybody,
  I am making python run an executable using the os module.  Here is
my question.  The executable, once it is running, asks the user to
input a filename that it will process.  Now, my question is how do i
automate this.  let me make this clear, it is not an argument you pass
in when you type in the exe.  An example below illustrates:

THIS IS NOT WHAT YOU DO:
nec2d.exe couple1.nec                         # couple1.nec is the
file you want to prcess

rather, what you do is in windows cmd:

nec2d.exe
**** PROGRAM PRINTS OUT STUFF*****
**** PROGRAM PRINTS OUT STUFF*****
**** PROGRAM PRINTS OUT STUFF*****
**** PROGRAM PRINTS OUT STUFF*****
Please enter input file:  <--------- THIS IS WHERE THE USER IS ASKED
TO TYPE IN THE FILENAME

everybody thanks for your help
-- Kiran