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What is the use of percent signs (%) at the end of lines?

I know that % is commonly used to uncomment parts of the code, but recently I read that there is another use for the percentage sign but I don't remember what it was neither where I read it.

For example in the following code % was placed at the end of several lines. What does % do in this case? (If required, I will provide a MWE.)

\newif\ifintoc
\def\@schapter#1{%
  \if@twocolumn
    \if@at@twocolumn
      \@makeschapterhead{#1}%
    \else
      \@topnewpage[\@makeschapterhead{#1}]%
    \fi
  \else
    \@makeschapterhead{#1}\@afterheading
  \fi
  \ifintoc
    \stepcounter{specialchapter}%
    \addcontentsline{toc}{chapter}{\protect\numberline{\thespecialchapter}#1}%
  \fi
}
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John
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    This looks very much like http://tex.stackexchange.com/questions/7453/what-is-the-use-of-percent-signs-at-the-end-of-lines. Please take a look and see if it helps: if so we will probably close this question as a duplicate, to keep the site organised. – Joseph Wright Nov 21 '12 at 18:24
  • @JosephWright You're right. You can close the thread (btw: can I close my threads myself?). When I typed in my question, http://tex.stackexchange.com/questions/7453/what-is-the-use-of-percent-signs-at-the-end-of-lines did not appear as a possible answer. – John Nov 22 '12 at 00:41

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