Can it do ans* etc. Is there a history of expressions and results. Is the history on-screen while next expression is typed. Is there a current result indicator,

Can it do ans* etc. Is there a history of expressions and results. Is the history on-screen while next expression is typed. Is there a current result indicator, i.e. live update of the expression result as you fiddle with parameters. Just what's coming to mind for basic daily use here.