How do I reinstall from system disks on my Imac?

I received two disks with my Imac. One is titled Mac OS X Install DVD; the other Applications Install DVD. I managed to get the first disk to boot up and install but not the second. In the first disk was the instruction "To start up from Mac OSX hold down the C key as the computer starts up. One the second disk is says hold down D key. I have made numerous unsuccessful attempts to get the second disk to boot. I assume that the installation of these two disks completes the system installation. I recently changed from a PC to a Mac and am still pretty green with it. Any help would be appreciated.

Hi,
You may find this Information of Use
MacWorld
http://www.macworld.com/article/142454/2009/08/install_snow_leopard.html
Apple
http://manuals.info.apple.com/en_US/Snow_Leopard_Installation_Instructions.pdf

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