I had been following the PDF guide and decided to put Longhorn on my dvd. Copied 'sources' and the noticed I needed to rename a folder named 'Boot' to 'CDSH'....

...when did this folder get created?

I can only find the one mention of it in the guide and that is the stage where you have to rename it.

Could someone please explain what I appear to be missing

Many Thanx

BOOT is the CDSHell folder. CDSHell is the boot menu. Most people do one OS at a time, and add the entry to the boot menu.

Longhorn requires you to change the BOOT folder for CDSHell to CDSH. It's easier then changing all the entries in Longhorn from BOOT to whatever.