VIM: using accent in portuguese

How you can see and use accent in VIM for portuguese language?
Como ver e usar acentuação no VIM para língua portuguesa?

Have two way to do this in *Unix.

1. In Bash profile (~/.bashrc), set the environment variable LANG to latin1 or one of this below:

• latin1
• pt_BR.UTF-8
• iso-8859-1
• utf-8

2. In VIM profile (~/.vimrc)

• set encoding=latin1
• set fileencodings=latin1
• set termencoding=latin1
• set nocompatible

You can test in terminal to see if it is ok:

in bash:

    export LANG=latin1

    vim

    write something with accent (e.g. Português)

in vim:

    :set encoding=latin1

    write something with accent (e.g. Português)