THE PROGRAM BOOK AND THREE ASSOCIATED DATA FILES ALLOW
AN ON-LINE USER TO SELECT AND DISPLAY ANY PART OF THE CP-V USER'S
GUIDE.  BOOK IS WRITTEN IN BASIC AND OPERATES ON ANY
TELETYPE COMPATIBLE TERMINAL.
..
USAGE:
..
 !BASIC
 CHAIN "BOOK"
RESPONSE: DOCUMENT NUMBER ?
ENTER:901692
RESPONSE: HOW MANY LINES PER DISPLAY ?
ENTER: NUMBER OF LINES DESIRED.
RESPONSE: THE DOCUMENT HAS XXXX LINES,
          OR YYY PAGES AT ZZ LINES PER PAGE.
          LIST CONTENTS ?
ENTER: YES OR CARRIAGE RETURN
RESPONSE: CONSULT INDEX ?
ENTER: YES OR CARRIAGE RETURN
RESPONSE: TYPE A WORD OR SHORT PHRASE.
          TYPE A PAGE NUMBER OR "END" TO EXIT INDEX.
          ?
ENTER: WORD OR TOPIC
RESPONSE: SEE A,B,C.
            OR
          TOPIC NOT INDEXED, TRY A RELATED TERM.
ENTER: TOPIC, PAGE NUMBER, OR END
RESPONSE: *** DISPLAY *** ?
ENTER: PAGE NUMBER, CARRIAGE RETURN FOR NEXT PAGE,
         INDEX TO CONSULT INDEX, OR END.
