Installing .dmg on Snow Leopard

I'm new to Macs and I have a Macbook Pro 13" standard with no frills and Snow Leopard. When I install the new version of something, like the iPhoneSDK.dmg for 3.1.2, does it uninstall the old one for me and just install the new one? Thanks.

Just a few semantics. A dmg is a virtual disk, you don't install those, you mount them by double-clicking on them, and use what's in them to install new stuff. For your example, the SDK most likely has one or more installer packages inside it that you launch and use to install stuff.
Once you get a handle on that, see these:
Switching from Windows to Mac OS X,
Basic Tutorials on using a Mac,
Mac 101: Mac Essentials,
Anatomy of a Mac,
MacFixIt Tutorials,
MacTips, and
Switching to the Mac: The Missing Manual, Leopard Edition.
Additionally, *Texas Mac Man* recommends:
Quick Assist.
Welcome to the Switch To A Mac Guides,
Take Control E-books, and
A guide for switching to a Mac.

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pawlowskikacper wrote:
P.S. Please don't ask why.
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pawlowskikacper wrote:
P.S. Please don't ask why.
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Dec 31 22:56:47 localhost Install Mac OS X Lion[343]: @(#)PROGRAM:Install PROJECT:Install-686.2
Dec 31 22:56:47 localhost Install Mac OS X Lion[343]: @(#)PROGRAM:IA PROJECT:InstallAssistant-209
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(67924)

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