1. Word Addressable I/O
   1. waopen - Opens a word addressable file
      1. iun
   2. waread - Reads a word addressable file
      1. iun
      2. buf
      3. addr
      4. nwords
   3. wawrit - Writes to a word addressable file
      1. iun
      2. buf
      3. addr
      4. nwords
   4. waclos - Closes a word addressable file
      1. iun
   5. WA_CONFIG environment variable
      1. page_size
      2. nb_page
      3. tot_page
      4. debug_mode
   6. FORTRAN example of use
   7. C example of use