使用缓冲区中的资料，将指定的字元数目写入序列埠。
Writes a specified number of characters to the serial port using data from a buffer.
流只不过是一个可以使用库功能读取或写入的字节序列，库功能向应用程序隐藏了底层设备的细节。
A stream is nothing more than a sequence of bytes that can be read or written using library functions that hide the details of an underlying device from the application.
两种类型的写入操作都可增加域控制器上的更新序列号，这意味着每当从其他DC复制了更改时，该序列号都会增加。
The Update Sequence Number on a domain controller is incremented by both types of write operations, which means that it is incremented whenever changes are replicated in from another DC.
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