OCS Inventory ipdiscover feature

Hi,

Do i need to install OCS Inventory NG Agent on all the 500 clients which needs to be populated in OCS Inventory NG Server or can i use IP Discovery feature of OCS Inventory NG server to automatically discover and push all client/desktop/laptop data to the Centralised OCS Inventory NG server.

Please correct me if i am understanding it completely wrong.

Thanks and Regards,

Kaushal