Drivers during boot

Yes, I just do not know enough about SCSI to know what will happen to his "real" SCSI devices if I do anything in Windows XP which is what is on the boot disc. Let me clarify - if it set up the SCSI devices in XP does that "mess up" the chain or device numbers when he reboots into server? I am unsure where and if this information is stored when I load the CD. In other words, will I cause the SCSI bus to look for something different when he reboots and then his server will not boot? This is my greatest fear and something I do not want to happen.