Can one put four operating systems on a Mac?

At the local Senior Center the Windows computers they have been using for computer instructions are dying. I want to suggest replacing them with Mac Minis. Among the people who go there there is a growing interest in learning Mac OSX that the Center has not been able to serve. But in addition, the need for teaching courses centered on Windows XP will continue as will the interest in its replacement, Windows 7. Some are also asking for classes in Linux. So my question is: Can a Mac have all four operating systems on it, say using Boot Camp, that are each separately bootable? Thanks.

Well, I got W7 on my N.4 drive but not the way I planed.
Bootcamp did not want to do it so I went trough the XP drive insted haha.
Boot from XP / from there I formated drive 4 / inserted W7 instal disk / chose drive 4 for the instal and voilà it works fine.
From the start option in the preference window in SL I see this...Sweet
http://web.ncf.ca/ev317/images/forum/boot.jpg
But when I do a cold start with the ALT presset down I get only 3 choices : Leopard or SL or Windows(Witch bring me to my last boot of windows XP or W7)I suppose - not confirmed. When I did choose the windows drive it opened in W7 witch was my last Windows boot.
Now all I need is another drive an Linux to do the same thing - go trough XP for the install and see what happen's.
BTW, W7 as recognised the keeboard and mouse from the start.. Everything works fine so far. Touche wood. :^)
Edit : You don't have to upgrade the driver on the Nvidia 7300 card like they say in the bootcamp documentation... Mine is not and W7 see's it fine.

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Snow Leopard Purchase
Check that your computer is compatible with Mountain Lion/Mavericks/Yosemite.
To check the model number hold down the option/alt key, go to the Apple menu and select System Information.
iMac (Mid 2007 or newer) model number 7,1 or higher
MacBook (Late 2008 Aluminum, or Early 2009 or newer) model number 5,1 or higher
MacBook Pro (Mid/Late 2007 or newer) model number 3,1 or higher
MacBook Air (Late 2008 or newer) model number 2,1 or higher
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As you play around as I did when I was waiting for an Apple Tech Rep, and reran the Combo Updater back over a wonky install, to find out if you could do that, it was done and worked great just as he returned and said no one there knew. I told him that I did and it worked great. We kept in touch for a couple of months to see if anything weird happened, which it didn't, and now it is suggested and common practice. Just as the Tech's and I whispered under our breath in the 90's about partitioning. Now they suggest it and Apple will talk to those that have partitioned. As you see needs and experiment you'll learn (trial by fire) and all this will become second nature. So don't think this is too much and go for it. Just make sure before you are completely comfortable, have another drive, I use 25GB Rewritable Blu-ray Discs, to do regular normal, CCC, back ups until you get the hang of it. This method yields 6-8GB compressed archives. Then you'll have a place for your stored back ups and whatnot. I was keeping up to 5 iterations, i.e.: 10.5.1a, b, c, d and e. Once my paranoia subsided I pared it down to two since I could easily recover the small amount that I have to now from small back ups that are mostly aliases relinking files that are safe on other partitions.
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