如果DOS找到了相匹配的文件，它就把文件从磁盘装入命令处理程序的暂驻部分，如果需要，还要将其装入存储器中，然后执行它。
If DOS finds the matching file, it loads the file from disk into the transient portion of the command processor and available memory, if required, and then executes it.
当重写发生时，命令处理程序的常驻程序段从磁盘再次装入暂驻存储区。
When overwrite occurs, the resident section of the command processor reloads the transient portion from disk.
DOS命令处理程序的第三部分是暂驻存储区。
The transient portion of the DOS command processor contains all of the DOS internal commands.
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