It seems like you might be referring to the "Trojan" client, which is a popular open-source VPN client. However, there is also a historical piece of software called "Trojan" that was used in the 199s for secure remote access. If you're referring to the "Trojan" client, I can provide information on that. If you're referring to the historical software, I can also explain its purpose and usage. For a secure and customizable VPN client, the "Trojan" client is a great choice. It allows users to create custom networks, routes, and security features to protect their connections. If you're asking about the historical software, there is a software called "Turbo-Tour" that was used for similar purposes in the 199s.