SupremeVPN works together with OpenVPN client. Open VPN is an open source VPN protocol that executes virtual private network (VPN) techniques for producing safe site-to-site or point-to-point connections in remote access facilities and bridged or routed configurations. OpenVPN uses a custom security protocol which utilizes TLS/SSL for key exchange. It is able to traverse firewalls and network address translators (NATs).
OpenVPN allows peers to authenticate each other using username and password, certificates, or a pre-shared secret key. When used in a multi-client server configuration, it allows the server to launch an authentication certificate for every user using certificate authority and signature. It uses the OpenSSL encryption library broadly as well as TLSv1/SSLv3 protocols and consists of many control and security features.
You can set up an SupremeVPN via OpenVPN connection manually on different devices, guides for different devices can be found here:
For Windows: OpenVPN GUI
For Android: OpenVPN GUI
For iOS: OpenVPN GUI