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HELP

 Enters the HELP system to obtain  help on the specified topic.  If  the
 topic is  omitted, the  HELP system  will display  a list  of  possible
 topics, then prompt for one of them.  On the DEC-20, the portable  help
 system may be replaced by the tree-structured EMACS XINFO system, which
 will provide extremely  fast screen-based editing  access to this  file
 (probably DOC:SLIDES.INFO), as well  as to anything  else in the  XINFO
 tree.  Besides being fast, XINFO  allows scanning forward and  backward
 in each node and permits keyword  and string searches.  Typing a  query
 inside XINFO will get you  help on how to use  it, and typing a Q  (for
 Quit) will get you back to SLIDES.