Eric asked me to post some advertisements for grub4dos.

If you are interested in multi booting I bet you know gnu grub 1.x, also 
known as grub legacy. Grub legacy will be no longer developed by the gnu 
  grub project. Them are now working on grub2 and they have their reasons.

grub4dos is a fork of grub 1.x legacy. Sure it must follow also GPL. It 
has some exclusive features:
- it has all features grub also has (example: chainloading other mbr is 
possible)
- chainloading syslinux/isolinux/memdisk (grub features)
- booting any linxu/bsd/or w/e (grub features)
- floppyimage to floppy emulation!
- iso to virtual CD-ROM emulation!
- it can initialize a real CD-ROM and boot it (useful for example in 
case your BIOS does not support booting from CD-ROM; also useful if you 
just booted and decided to boot now from CD-ROM)
- it can chainload an FreeDOS, DR-DOS, MS-DOS... kernel.sys directly
- it can also chainload Win9x and WinNT directly
- you can start grub4dos from within DOS (just after start or when 
unloaded incompatible TSR`s)
- grub4dos can be also started from within NT bootloader
- when started it removes the old operating system (such as FreeDOS) 
from the memory can start a new one
- sure grub4dos can be also direclty booted (not only thought DOS or NT 
or Linux)
- just like for grub it`s no problem for grub to boot from floppy, 
CD-ROM or USB (if the BIOS does support booting these devices)

Note:
Floppy / Iso Emulation works well with most 16 bit operating systems 
such as FreeDOS. Some 32 bit operating systems (such as Windows XP or 
Puppy Linux) don`t like this. You can not download a Puppy Linux 
bootable iso, store it on your harddisk, emulate it with grub4dos and 
use it. However, it`s bootable. But after the 32 bit operating system 
uses it`s own controller driver it will crash because it loses 
connection to the virtual device.

- The manual can be found here: 
http://grub4dos.sourceforge.net/wiki/index.php/Main_Page
- An English forum: http://www.boot-land.net/forums/?showforum=66

Any questions can be asked in the forums or on their mailing list. You 
can also try the Chinese forum and a Chinese translator (never tested 
myself).

PS:
If you want to chainload a bootsector from an USB device and your BIOS 
does not support booting USB directly then you may try PLoP Bootmanager 
(http://www.plop.at/en/bootmanager.html) (freeware, closed source)

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