2nd Win98 OS in the 2nd drive?

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I have Win 98 on my C drive (running for 3 years!) . Can I tell the Bios to start with D drive (it is a phisical 2nd drive), and to install ANOTHER Win 98 there (or maybe other OS), without any special problems?
For example:
1) can I later ask the Bios to return to the old sequence starting with C drive, and have the old installation work as before? And again to return to D - as the 1st  booting drive?
2) will I be able to access both drives as I can do now?
3) will the new Window installation understand and "protest" that I already have the old one (and vice-a-versa?)
4) any other problems?