Booting different Mac operating systems.

In the Windows world, the user can set up a computer to allow the selection of different operating system versions, such as Win98, WinXP, WinVista, to be chosen at startup.
Can this be done with Leopard, or possibly Snow Leopard? I'd like to upgrade, yet keep the existing system installed. I am not referring to using an emulator like Parallels Desktop, I'm already doing that.
One of the things that's the most frustrating to me is the different terminology used. Took me awhile to figure out that Airport is wireless networking, and today I discovered that Automator appears to be a macro recorder. Yet I've got a friend who could never figure out the other terms but the Mac terms make perfect sense to her!! Go figure!!! LOL
And before someone suggests it, I bought a Leopard book last spring when I bought this Mac, but a summer job I took involved 10-12 hour workdays and I just haven't had the time or energy to get it read.
Ken

Supported different Mac operating systems (and unix-like Linux for Mac) can be
booted in the same computer; in order for multiple Mac OS X systems to work,
they need to be in their own partition so as to not mix up their differences, and
applications that may work well in one may not do so well in another. So, each
OSX has its own Applications and other folders, in their own home partitions.
Snow Leopard 10.6.x is intended for Intel-based Macs; Leopard 10.5.x is the
last version supporting PPC-based Macs. Some PPC Macs did not like 10.5.
You could probably use a bootable externally enclosed hard disk drive to have
additional system(s) available for the computer, instead of reformatting the HD
& partitioning it for several systems. The OEM drive may be too small for more
than one OS installed, depending on the uses expected and storage demands.
Computers that can't support the latest OS X 10.6.x won't, and they can't use
an older OS X than the one they shipped with, the exact as-shipped version.
Some models can run several OSs including variants of Linux or unix for Mac,
and select supported OS X versions; plus older Macs running dualboot OS9/X.
The Support pages on the Apple site have helpful information on specific Macs
& other hardware, so that may be of help to read about each model in question.
Also, the free download offline database: http://mactracker.ca is fairly handy.
Good luck & happy computing!

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