A controlword is a specially formatted command that RTF USES to mark printer control codes and information that applications use to manage documents.
控制字是一种特殊的RTF用来标记打印机控制符的格式化命令，也是程序用来管理文档样式的格式化信息。
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The order of the commands in the controlword is determined by information in the label field, such as whether the command is performed in parallel with a preceding command.