Windows Interface is object oriented. In DOS Prompt, decide what to do first, then decide an object. For example, when copying files, write programs as follows. C:\> copy file_a file_b It shows the operation "copy" and then its object "file_a".(file_b is the destination). When deleting files, write programs as follows. C:\> del file_a

How about on Windows operation? On Windows, click a file which is to be deleted.

You'll have a menu as above, so choose what to do. As you can see, on Windows, having an object first, then decide what to do. This system is called "Object Oriented".