Where can I learn more about how to use the GRUB `ntldr` command (module?)

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http://unix.stackexchange.com – I recently stumbled across the GRUB ntldr command. (Or is it referred to as a module? I am not sure what the correct terminology is.) Apparently one of the things it can be used for is as an alternative to chainloader to boot the NT >= 6.0 versions of Windows as in the example below. (Very handy if the Volume Boot Record for a Windows partition is, uh, corrupted.) menuentry "Windows 7 (bootmgr on /dev/sda1)" --class windows --class os { insmod part_msdos insmod ntfs insmod ntldr set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 1EA0019AA0017A13 ntldr ($ (HowTos)