A parked domain points a new domain name to the same directory that your primary account points to.
How to setup a parked domain
If you registered your domain with someone besides Host 99, make sure that the name servers are pointing to the nameservers that is sent on the welcome email of Host 99, if you are unsure about the details please contact domains at host-99.com to get your nameservers details. In your Host 99 cPanel, select 'Parked Domains' under the 'Domain' menu and enter the domain name you wish to park in the 'Create a New Parked Domain' form.