If you have important information on another Mac (a completely different machine from the one you are installing Tiger onto) or a partition or volume on the new Mac, you can transfer the information from the older machine, partition, or volume to this new Mac. You'll use a feature called
Network and computer settings.
User accounts, preferences, and email.
Documents and other files.
Applications.
Some applications, however, will need to be reinstalled from their original disks because they install necessary files in different system folders. All you can do is transfer them, then open them and see if they work. The more expensive and complex an application, the less likely it will transfer perfectly.