org.openide.util.Lookup.getDefault().lookup(org.netbeans.api.javahelp.Help.class).showHelp($c)
:: $c instanceof org.openide.util.HelpCtx
=>
$c.display()
;;

org.openide.util.Lookup.getDefault().lookup(org.netbeans.api.javahelp.Help.class).showHelp($c, true)
:: $c instanceof org.openide.util.HelpCtx
=>
$c.display()
;;

org.netbeans.api.javahelp.Help $h = org.openide.util.Lookup.getDefault().lookup(org.netbeans.api.javahelp.Help.class);
if ($h != null) {
    $h.showHelp($c);
}
:: $c instanceof org.openide.util.HelpCtx
=>
$c.display();
;;

org.netbeans.api.javahelp.Help $h = org.openide.util.Lookup.getDefault().lookup(org.netbeans.api.javahelp.Help.class);
if ($h != null) {
    $h.showHelp($c, true);
}
:: $c instanceof org.openide.util.HelpCtx
=>
$c.display();
;;