Synopsis # YP (Yellow Pages), also known as NIS (Network Information Service), is a simple protocol for sharing configuration databases such as user accounts, group memberships, and hostnames across a trusted local network. OpenBSD includes support for both YP servers and clients in the base system. YP is not the same as LDAP, and it is important to distinguish them: YP is an older, RPC-based system developed by Sun Microsystems. LDAP (Lightweight Directory Access Protocol) is a modern, exten...