Apart from the document , additional inserts can also be included using the enveloper . a computer screen is installed to inform the operator of the status of the job and if any problems have occurred 除了文件本身，入信机还可以把其他宣传单张一并放进信封内。这部入信机装有电脑荧幕，操作员可以透过荧幕监察运作的情况。
