Term               Meaning
  ====               =======
  mailer or MUA      Mail user agent such as pine or elm
  pico               PIne COmposer - a user friendly editor
  reader             Mailer, newsreader, or Web browser that can read 
                     mail folders
  regular expression Text that can include "wild cards" (such as . to
                     match any single character); used for searching
  ^x                 Press the Ctrl key and then, while holding down the 
                     Ctrl key, press the x key
  ~ or $HOME         Your home directory.  You can always get to your
                     home directory by typing `cd'.

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