If a script has a call to system(…), or ..., or IO.popen(…) and is
run with rubyw.exe, the call causes a console window to pop-up briefly.
(Calling the script with ruby.exe will not cause this, I assume because
it already has a window).
I noticed this as I have applications I start as .rbw and they pop up
consoles in the background (was kinda hoping to avoid that. That the
whole specifying them as .rbw is all about 
This happens on WinXP. I think it’s a ruby bug, but am willing to blame
Microsoft
Anyone have a clue on how to prevent this?
Cheers,
Assaph