Diff between vim and macvim ( command \ll )

Hello all!

I am quite a newbie in vim.

In MacVim the command \ll (That means \ + L + L) compiles my LaTeX file, which I am just editing, with the command pdflatex (coming out is a .pdf file) - But in my Shell-vim with only the command latex (coming out is a .dvi file).

Supplemental question: how to look for such kind of commands in vim :help ?

Oh sorry. An other question again: MacVim is inserting sometimes a <++> in my LaTeX file. Why? I have to remove it many times, while editing.

Thank you for your help

marek