Changing priority while running

I know I can use something like:
  nice tar ...
to start a job (tar in the above example) with a low priority.

I'd like to know if/how I can change a background job's priority AFTER IT'S ALREADY STARTED.

I'm using AIX 4.3.2 (if it makes any difference).
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tel2Asked:
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ozoConnect With a Mentor Commented:
renice
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tel2Author Commented:
Thanks ozo!
That was a little brief, but coupled with the "man" command, that was all I needed.  Keep up the good comments!
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