apt.conf wheezy 7.1

I am trying to set up apt.conf.

The question is:

What or How does the Debian developers place in written text the _expression_ for Intel 64 bit.

I can see at this page:

That the Intel 64 bit is expressed as amd64 for the designation Architecture as shown in the table.

In the apt.conf example file there are two apt options, i assume that they are options from what i read.

Architecture ----- singular

Architectures ---- plural

In the example file or the man apt.conf file the Architecture is shown as i386.

The i386 is usually associated with 32 bit.

Here in these e mail posts i am just trying to get the goolosh strait.

Architecture

Architectures

And what are the correct words, names, expressions for these fields.

I am working with a pre installed machine with a 64 bit Intel

Ivy Bridge i3-3110M 2.4 GHz

This is what the example file show:

<!--

apt {

architecture “i386” ; // i386 is usually 32 bit Intel.

architecture :amd64; // Intel or amd

}

-->

Or do people just ignore the apt configure and preferences tools.

Thank you