GLOBALS:

{_SESSION[hello]}
{_GET[fred]}
{GLOBALS[abc]}

Privates:

{_somemethod()}
{_somevar}

Global methods

{GLOBALS.date(#d/m/y#)}
{if:GLOBALS.is_array(test)}
{end:}

{foreach:atest,k,v}
{if:GLOBALS.is_array(v)}
{end:}
{end:}