I have made previous post in another discussion in the forum, that I have tried easyBCD, sudo within the Leo install DVD, format my disk partition my disk with Guid and mbr, but no luck at all with dual boot.

So since it seams impossible to configure my pc to dual boot, so instead of this I can change each time the active partition and boot to the other OS, but I don't know how to I do this within Leopard from Terminal.