open DOS window and start application

[Marcus Stojek]

Hi,
I have written a little job manager that is monitoring and starting
very time consuming simulation jobs (separate application). This 
application has to be started in a DOS window. 

How can I open such a DOS window?

How can I start several jobs (one after the other) in THIS window?
(not open new windows for each job)

How can I change the current dir in this window?


I tried: os.system("start application [-parameter] jobname")
which works fine for one job. But i can't change directories and i 
can't start a second job in the same window.

Thanks
Marcus