Seeing output of background process

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http://www.unix.com – I'm pretty sure I had the answer to this months ago and have misplaced it. Needless to say I will bookmark it this time. I have a background process that's been running way longer than usual. It doesn't output anything to a file, so I can't 'tail -f' it. Is there a command that will enable me to see the output the process would be sending to the screen if it was not in the background? Thanks. (HowTos)