{smcl}
{p 0 4}
{help contents:Top}
> {help contents_basics:Basics}
> {help contents_syntax:Syntax}
> {help contents_expressions:Expressions and functions}
{bind:> {bf:System values}}
{p_end}
{hline}

{title:Help file listings}

{p 4 8 4}
{bf:{help _variables:System variables}}{break}
    expressions may contain system variables called _variables

{p 4 8 4}
{bf:{help creturn:Constant and current-value class}}{break}
    constants such as pi and current values of system parameters

{hline}
