Dual boot mac imac - how to get it to default to windows

I don't know muh at all about macs.  A client has a bunch of dual boot macs - they have windows vista and mac os installed.  some boot right into windows (maybe they don't have mac OS on those?).  Some though, you have to hold down the option key right at startup, you then get 2 pictures of hard drives 1 is mac and 1 is windows.  you click on windows and it boots into windows.  if you don't press the option key and choose windows, it will default to mac OS.  is there a way to change the default OS to windows?

By the way, is that boot camp?  or is bootcamp something else?  I don't see any markings about bootcamp.  Just a dual boot imac desktop.

thanks!

thanks!
ThisIsAToughOneAsked:
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strungConnect With a Mentor Commented:
On the Macs that boot directly into the Mac OS, do the following:

1. Boot into the Mac OS.
2. Pull down the Apple Menu to System Preferences.
3. Click on the Startup Disk icon.
4. Set the Startup Disk to the Windows partition by clicking on that partition's icon in the window.
5. Click the Restart button.

The computer should now start in Windows automatically.
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faizbaigCommented:
Yes, You need to install "Boot Camp" on Mac via Mac OS DVD.
Once boot camp install you don't have to hold key to choose...it boots directly to advice OS

More info on Boot camp
http://support.apple.com/kb/HT3777
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ejg398Commented:
Use Mac OS X Startup Disk preferences to set the default operating system to use each time the computer starts up. so you can select either to always boot to the mac os ro the windows OS
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faizbaigCommented:
Just for info.
->Mac OS X v10.5 and later includes Boot Camp that lets you run Microsoft Windows.
->Boot Camp supports Microsoft Windows XP with Service Pack 2, Windows Vista, or Windows 7 (requires Mac OS X v10.6 or later and Boot Camp 3.1 or later).

Attach Boot camp installation guide.
Boot-Camp-Install-Setup-10.6.pdf
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