Grub Multiboot menu

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Grub Multiboot menu

I installed Artabros on my hard-drive (hda3). The hard-drive already had Legacy Os Linux (on hda2 and  Swap on hda1).Grub didnot include the other OS. I am not a programmer but I would like to have the dual boot ability. 

I would appreciate your help in configuring Grub to reconise the other OS and give me a choice to boot either one.

Thanks for your help.