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发表于 2005-8-26 21:16:39
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There are three things need to be pointed out:
1: Program IS NOT Software theorically. In a high-level sense, several programs can be treated as a module, and several modules can be treated as a software.
2. OS is a non-stop, self-terminated, and virtual-machine-form software as long as PC is on, and which is responsible for handling the process-management, input-output management, memory-management, and file-system management.
3. A OS can be viewed as a kernel mode or a supervisor mode which means protected from user tampering by the hardware, and this is opposed to the User mode. Compiler and editors can be a application because it runs in user mode. Whether recognize it's a OS portion or application portion depends on which mode it runs in.
That's the brief view about OS. |
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