China DOS Union

With Windows running rampant today, it's not easy to have a forum about DOS. I sincerely thank all the moderators and super moderators for your efforts; they have helped a newbie like me improve a lot.
Recently I've been making a bootable CD that integrates many DOS tools, and I've run into trouble determining the CD-ROM drive letter. To be specific, I mean like a Windows installation CD: no matter what your CD-ROM drive letter is, it can automatically load the CD-ROM driver and install the system. I don't know how that is implemented. Right now I only know how to use the following command in AUTOEXEC.BAT to set the CD-ROM drive letter to X:
LH MSCDEX /D:MSCD000 /L:X
Its drawback is that if there are two or more CD-ROM drives (I happen to have one CD-ROM and one CD-RW), the boot CD can only be used in the primary CD-ROM drive; if run from the secondary drive it says it can't find files. Please advise, thanks

You can add two sections to the batch file:
The first section sets the second CD-ROM drive letter according to the first CD-ROM drive letter.
The second section uses if exist to determine which CD contains a certain specific file, and then performs the corresponding operation.

I don't understand what you mean, it's too deep for me. For a newbie like me, I saw the following command on another forum, and I only half understand it:
LH %ramd%:\MSCDEX.EXE /D:mscd002 /L:%CDROM%
%CDROM%
It would be best if you could explain how the first "Install Windows98" option on the Windows98 installation CD is implemented when booted under DOS, then I could try following that.

This is a bit troublesome to explain clearly.
FreeDOS has a FINDCDROM program; maybe it can come in handy.

I think it's called FINDCD!!!
Add another batch file, and it can be done.

Is this what the poster above meant???

But I don't know how to use the FINDCD command?

Learn how to ask questions first.
Change your post title to something better.
For posts with titles like this, in the future there may be only these three possible outcomes:
1。No one pays any attention. (This is the best case.)
2。It gets moved to the off-topic section.
3。It gets deleted.