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Query (?)

 Request help  from the  parsing system.   This query  character may  be
 entered at the  beginning of any  command field, and  when the line  is
 entered by typing a carriage-return, help  will be given, usually as  a
 list of possible keywords, or an indication of what kind of token (e.g.
 "floating-point number") is expected next.  It can also be given as the
 final character of a keyword, in which case the help display will  list
 only those keywords which match up  to that point.  After giving  help,
 the query character is  deleted from the input  buffer and the  command
 line is retyped, allowing additional characters to  be appended to  it.
 The query character  can be  changed at any  time by  the EDIT  command
 described below.