task swapper造句

The shell also has a help system, " program list ", and a " task swapper ".
Sure enough, the question about task swapper was in the text, but I couldn't make the answer work.
It isn't available in plain DOS, but the Task Swapper in the DOS Shell offers a primitive version of it.
I went through the tutorial, but when I got to the section on the Task Swapper, which lets you keep more than one program open at a time and switch between them, I couldn't make it work.
It's difficult to find task swapper in a sentence. 用task swapper造句挺难的