During installation, the installer prompts you for this serial number. In 2006, Corel used an online activation server to validate these keys upon installation. The Status of Legacy Activation Servers
If you're looking for a product key, here are some possible sources: coreldraw 13 product key
A CorelDRAW 13 product key is a 27-character alphanumeric code formatted in distinct blocks. This key validates your purchase during installation and unlocks the full graphics suite, including Corel Photo-Paint and Corel PowerTRACE. Without a valid key, the software will either refuse to install or run in a restricted trial mode. The Risks of Key Generators and Cracks During installation, the installer prompts you for this
Simplified photo editing capabilities.