&tde-authors; &tde-release-version; Reviewed: &tde-release-date; &tde-copyright-date; &tde-team; This handbook describes the pcf protocol. TDE pcf protocol The pcf protocol provides support for reading profile configuration files (pcf), which store information about client connections in virtual private networks (VPN). The ovpn protocol provides support for OpenVPN, a free/libre implemetation of virtual private networks (VPN).VPNs are used to connect private networks using public network infrastructures and encryption.