Protocol ↔ (standard) set of rules for something?
References
Synchronous Iteration↔ Protocol to connect data source & consumerOAuth 2.0↔ (Protocol)(standard) to Auth user w/o password. cur ver 2.0HTTP Basic Access Authentication↔ Protocol to authenticate via HTTP header to send username/passwordPP2P↔ Private P2P Protocol to restrict access to only mutually trusted Peers