Two (or more can be installed at the same time). On a normal PC only
one can "operate" at the same time. You chose via a menu on boot-up
which OS is to start.
You can use something like VMWare to operate multiple OS's
simultaneously on a PC.
Yes. Many of us have been dual-booting multiple installations of Windows
for years.
It's not a good idea to have more than one Windows in a single volume
(primary partition or logical drive in an extended partition). But, so long
as you don't run out of volumes or disk space or drive letters, you can
install one copy of Win9x/ME, plus as many copies of WinNT4/2K/XP as you
have licenses for.
Only one Windows can be in charge at any one time, of course, so you will
need to reboot to switch from WinME to WinXP, for example.
The answer is yes, you can have multiple operating systems on a
computer. If they are friendly toward each other and not greedy, they
can be put on the same partition of the drive. If they are unfriendly
(and I generally consider Windows unfriendly in this sense as it assumes
it is the only OS availible and wipes out bootloaders) then you will
need to use different partitions or even different drives to store them.
The answer is yes, you can have multiple operating systems on a
computer. If they are friendly toward each other and not greedy, they
can be put on the same partition of the drive.
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