Does anyone still use an old Apple iMac desktop computer?

This is probably a long shot because of how outdated it is, but how do you install Tiger or Snow Leopard on it if you have the discs for them? I got ahold of my grandfather's old flat screen iMac and want to see what is on it, such as iTune music or photos. I'm not sure if it was wiped clean but I can't get anything to work.

Does anyone still use an old Apple iMac desktop computer?
Does anyone still use an old Apple iMac desktop computer?
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