UNIX for Dummies Questions & Answers

Maybe it's an stupid question but remeber... I'm Junior..
I use command line to run programs, and some of them gives a lot of information when, for example, you open a window or other actions. That's really bad because my terminal gets full of unwanted messages, so I use "bin file & >/dev/null" to avoid the problem.
It work's fine for almost any program but it doesn't work for others ( mozilla ). I know that maybe is because the file that I execute calls other files and are the others that send those messages to my screen.
So here is my question: How can I force a file and childs to use /dev/null as info/error output.

Thanx and sorry for my poor english. It's not my natural language..

Try...

someprog > /dev/null 2>&1 &

...this will run "someprog" in the background with
stdout redirected to /dev/null and stderr redirected to
stdout (now /dev/null)