I am familiar with how to add the XP Recovery Console as a boot option to the LOCAL active disk (c:), that is not a problem:
Question is, how to add it to an offline system, for example a D: drive I mounted via USB adapter because its copy of XP suffers bootup problems when inside its home laptop?
For starters I could edit its boot.ini with a fake new entry (last line):
[boot loader] timeout=11 default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS [operating systems] multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=OptIn C:\CMDCONS\BOOTSECT.DAT="Microsoft Windows Recovery Console" /cmdcons
Of course C:\CMDCONS\BOOTSECT.DAT doesn't exist so that goes nowhere.