calling a program without waiting for it to finish

[mnietz]

> You need to look at os.fork and os.spawn* and choose the method that suits
> you best.
> 
> regards

I've tested this now, but in some cases I get an OSError Errno 11
Resource temporarily unavailable. I've been looking around, but none
of the given advises (to many processes running, lack of swap) fits.
Actually it works in one programm continuously, but not in another
programm (with nearly the same code)

Any proposals?