My system is set up with 6 OS and no boot loader. The OS
to boot into is set within each OS ... say i in 98 and i
want XP next reboot then switch active primary and
reboot ... presto.

Each OS must go into it's own primary partition and
because there can only be 3 primarys if you want a logical
chain of extendeds ... 3 OS's per HDD.

Take if you want 3 OS : make 3 primarys and then an
extended partition with a few logicals in it. Now hide two
of the primarys ... boot and install. Do this for each
primary .... you now have 3 OS. Only problem left is to
select the active (unhidden) partition for next boot. This
can be done with GDISK/GDISK32 or pqbw on my sys i have 2
HDD so i set it up for 6 OS but it don't work great and
fails for networked boot from second drive when all
primarys are hidden/inactive on first HDD.

What is really slick with this method is that using ghost
one can switch an image in a primary in about 5 min ... so
any number of OS can play with. Install it ... image it
and place another image there at will.

Best