There are three ways to switch to another
operating system partition:
Enter dos at the boot prompt (to boot the first DOS
partition) or boot an arbitrary partition using the
bootos(HW)
command at the boot prompt.
Use a floppy disk that contains the files necessary to boot the
DOS operating system.
Use fdisk to change the current active partition.
When you use the boot prompt or a floppy disk to boot another
operating system,
the UNIX partition remains active even though you have
switched operating systems. When you use fdisk,
the UNIX partition is inactive until you switch back to it.