At its simplest, split your list of document filenames or urls into (say) 4 files, then (concurrently) run 4 copies of your program supplying a different filename to each.
Beyond that, we'd need to see the structure of your current program before we could advise on ways of multi-tasking it.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
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