!! +exec+ +jump+
$lst_tit changeto $lst_titend$type_exec
  $(lst_syntax)changeto $emph file$emphend [$emph parm$emphend]</tt>
  $lst_mean 放弃当前文件, 转而处理 $emph file$emphend. 
  $emph file$emphend 处于 $emph read$emphend 状态.
  <br/>在新文件 $emph file$emphend 里可以利用变量名 $emph wims_read_parm$emphend
  引用参数 $emph parm$emphend.
