Most computer systems allow you to select an alternate boot drive (F12). This is usually done when you want to boot from the CD-ROM; to install the operating system.
If you are going to install a second copy of the Windows XP operating systems on the slave drive, all you need to do is place the Windows XP on the CD-ROM drive, during boot up press F12 the system will prompt you to select from a list of devices, select the CD-ROM and proceed to install.
When prompted to install in the hard drive the installation program will look for a previous Windows XP installation; the one you have on C: and will ask you if you want to repair the installation, press ESC key and then select from the list of the two drives: F: drive as the disk you want to install the operating system.
The program will ask you if you want to format the drive; for a clean installation, select quick format, and proceed with the installation. Make sure you don’t have data that you require on the drive; you will loose it when the quick format is completed.
Once is completed the program will create a boot file with two identical Windows XP entries, the first entry will be your last installation, and the second will be your C: drive. You can change the default operating system C: or F: via the control panel System Icon, Advance Tab, Settings. There you can set the default start up operating system.
A piece of advice you can install Windows XP over Windows 98 since it was create afterwards. However you cannot install Windows 98 as a second operating system over Windows XP. You will loose all Windows drive markers, and you will not be able to access Windows XP unless you are familiar with the Boot.ini and other startup files required by Windows XP.
You installation sequence would need to be: Windows 98, ME, 2000, Windows XP, Windows Server 2003: Previous generation operating systems are not retro-fit to create the correct boot entries for subsequent operating systems.