From: Richard M Kreuter <kreuter@pr...>  20080610 20:52:10

Blake McBride writes: > > The Lisp REP treats those specific symbols as a history mechanism > therefore their values are dependent on how they are used in the history > mechanism  which is system specific. What's systemspecific about these variables? From the CLHS:  The value of ‘’ is the form that is currently being evaluated by the  Lisp readevalprint loop. and  The value of ‘+’ is the last form that was evaluated, the value of  ‘++’ is the previous value of +, and the value of ‘+++’ is the  previous value of ++. and  The value of ‘*’ is the most recent primary value that was printed,  the value of ‘**’ is the previous value of *, and the value of ‘***’  is the previous value of **. and  The value of ‘/’ is a list of the most recent values that were  printed, the value of ‘//’ is the previous value of /, and the value  of ‘///’ is the previous value of //.  RmK 