processing of unused H1B visa

Hi. I have a H1B visa from company A obtained on feb2013 and expired on dec2013. I have my visa stamped but never travelled. I wish to few details

  1. if I m willing to reuse my visa and apply from company B , what is the exact procedure?
  2. since my H1B visa was through lottery system successfully last year, if I need to go again for the lottery process to renew my visa.