短信收发程序，能从一个目录中固定格式的文本文件中读取出相应的信息，发送出去。-SMS transceiver procedures, from a directory fixed format text file to read out the corresponding information sent.

connect to handset, read SMS and write SMS

PDU是用来发送短彩信的一种编码，上述代码为VB彩信pdu解码。-Wish to develop SMS or EMS application? What do you read from your mobile? PDU code. PDU is a format which you send to a phone to send a SMS or an EMS. You can find more in GSM 03.40