Customizing myheadings

Hello.
Would someone please explain to me what is being done in this following
TeX definition?

\def\bodyoftext{
\def\ps@myheadings{\let\@mkboth\markboth
\def\@oddfoot{\protect
\hbox to\hsize{\centerline\thepage}}
\def\@evenfoot{\protect
\hbox to\hsize{\centerline\thepage}}
\def\@evenhead{\protect
\hbox to\hsize{\emph{Chapter \leftmark}\hfill \me}}
\def\@oddhead{\protect
\hbox to\hsize{\me \hfill \emph{Section \rightmark}}}
\def\chaptermark####1{\markboth{\ifnum
\c@secnumdepth>\m@ne\thechapter\\ \fi: ####1}{}}
\def\sectionmark####1{\markright{\ifnum \c@secnumdepth
>\z@\thesection \\ \fi: ####1}}
}
\cleardoublepage
\setcounter{page}{1}
\pagestyle{myheadings}
\pagenumbering{arabic}
}

I am particularly interested in understanding the \def\chaptermark####1
and
\def\sectionmark####1 parts. What do all the #### mean?

Thank you in advance for your help.
Regards,
Marco.

.

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