This is How GHOST performs Windows NT Recovery,

Ghost 2001 runs from outside the Windows Operating system. When you install
Ghost, it creates a boot disk that contains variety of drivers including
Ghost program. The disk is designed to be universally compatible so it works
on most of the NT servers.
Once you boot that server with this functional disk, you can create an image
file of the disk or partition containing windows operating system and
applications. You could also tell the program to place that image ona disk,
CD or multiple CD's. It has different levels of compression levels built
within the program.
You could also make the CD where you place an image to be a bootable CD.
While restoring, you simply insert the CD into the drive and boot from it.
Youer server will automatically load ghost from the CD, and the files from
the Backup set will be available right aaway. This process also works from
outside windows, you don't have to go through installing operating system.
It completely restores your operating system including device drivers and
applications associated with it.
I hope this Helps.

Prasanna