China DOS Union

Many thanks to Climbing for the enthusiastic help. This is really practical, hehe. For newbies like us, it's very convenient. Thanks again.
But there is one problem: after I enter DOS, I can't get back out. Using exit, entering win, etc. all don't work. In the end I had no choice but to press ctrl+alt+del and restart to solve the problem. My operating system is winxp. How should I exit?
Let me ask one more question: I used the floppy disk image posted by the forum admin and used winimage to make an installation disk. If I want to install it, do I need to go into the BIOS and change it to boot from floppy? Also, during the installation process, a DOS-like environment appeared with the prompt "img> ", but the installation interface did not appear. What is the reason for this?

Looks like you really don't understand the difference between DOS and XP very well. The DOS you boot into is a DOS environment completely unrelated to the XP system, just like having one Windows and one Linux on your machine. If you've now entered Linux, then the only way to get back into Windows is by rebooting. Could it be that before, after entering the Microsoft Windows item in the boot menu (that is, DOS), you could directly type the win command to return to XP? Obviously not. If you could, that would prove you weren't using XP at all. I haven't used Wengier's installation disk, so I can't answer your later question.

Thanks, I've benefited a lot.