problem popen and 'start' (Win32)?

[nobody]

I'm using popen to trap the output of programs, but if I prefix my command
with start it still waits for it to quit.  This should only happen if I use
'start /wait'

I'm using a loop like:

while 1:
  line = child.readline()
  if not line: break
  (do stuff with line)

Is that not right, or is popen broken?  FWIW, os.system functions
correctly..