.xx "intro" "miscellaneous useful information pages" .xx "ascii" "map of ASCII character set" .xx "environ" "user environment" .xx "eqnchar" "special character definitions for eqn" .xx "hier" "file system hierarchy" .xx "mailaddr" "mail addressing description" .xx "man" "macros to typeset manual" .xx "me" "macros for formatting papers" .xx "ms" "text formatting macros" .xx "term" "conventional names for terminals"