A system and method for delivering content is disclosed. A content download service initially registers client computing devices to receive content. Therefore, when the content download service receives a request from a requesting client computing device to download content to a receiving client computing device, the content or download instructions are sent to the receiving client computing device. Downloading is controlled by the content download service and a software agent installed on the receiving client computing devices when they are registered. Content request and content download occur over a computer network, such as the Internet. The content may be stored by the content download service and supplied to the receiving client computing device by the download service, or stored by a content supply service and supplied to the receiving client computing device either directly or via the content download service.