[OS X TeX] eqnarray and \def statements

[Sylvan Jacques]

I am using a new eqnarray command someone has provided, and
am reading in "A Not so Short Intro" on how to do this.

The file I want to implement starts with 

\makeatletter

\def\eqnalign{%
   \stepcounter{equation}%
   \def\@currentlabel{\p at equation\theequation}%


and has several \def\name  lines, which I take
to be the new commands.

Reading further, I see that "Not so Short..." talks of
\newcommand, but I can't find \def, even in the index.

I am using TexShop, and my first question is, should I try
to modify my tetex files, or keep this as some kind of
macro in TexShop (which I prefer if possible).

On installing packages, I read that I must run latex on the
.ins file and extract a .sty file.

Is that necessary? Can't I just creat a macro in TexShop?


=====
Van Jacques   vanjac12 at yahoo.com
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