1.) Tiger's installation CD set/DVD is intended to be installed on _one_ computer and on _one_ computer only, whether it's the retail box you've bought or the one that came with your computer. The license does _not_ allow you to install Tiger on _any_ other Mac - unless it's the family pack, which allows the installation of Tiger on up to five Macs in the same household.
2.) Technically, the retail box allows installation on any supported Macintosh computer. (But as said in point 1, installing on more than one machine would violate the license, so DON'T do this!) Read the box' details about hardware requirements. Basically, the Mac has to have on-board FireWire as a minimal requirement, and you need an optical drive capable of reading DVDs (you can use the exchange program to get Tiger on CDs, but won't find a CD set in any of the retail boxes in stores).
2.) Technically, the retail box allows installation on any supported Macintosh computer. (But as said in point 1, installing on more than one machine would violate the license, so DON'T do this!) Read the box' details about hardware requirements. Basically, the Mac has to have on-board FireWire as a minimal requirement, and you need an optical drive capable of reading DVDs (you can use the exchange program to get Tiger on CDs, but won't find a CD set in any of the retail boxes in stores).