> There is a shareware product called pqmagic. It let you make as many
> partition or disks bootable as you wish on any operating systems ( dos,
> linux, windows )

The brand name of this package is Partition Magic.  It will let you create
more than one partition that CAN be primary, but only one can be active
at a time.  PM has the facilities to let you change which primary
partition is the active one - which is a dual (or more) boot system, like
Olin said.

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