-----BEGIN PGP SIGNED MESSAGE----- Various correspondents have pointed out that X.25 is an "open system" in that it is not proprietary. I knew that. I was thinking more of hierarchical vs peer-to-peer. I have been under the impression that TCP/IP connections are more peer-to-peer between different sorts of networks (or nodes) than X.25. Isn't X.25 more of a standard for a single network? Don't X.25 networks need someone more "in charge" than TCP/IP networks, or am I mixing up different layers on the OSI reference model? Which gives me an opportunity to post the only mnemonic that I ever created: Read from the bottom up: (and) Anarchists Application Progressives Presentation (back when it was Communication, it was Commies) Socialists Session Trust Transport Never Network Departments Data Link Police Physical DCF -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBMWvBIYVO4r4sgSPhAQHmegP/bPmRjFRpbczDfQTpTbfGgnLmuvWp6cBb J62Rp/LW0tOnBOW4rrf/d88AUTlh4sesn1daxn+3LEL1zgSaZromjW6i+lRSK+cw AkShAuuTJUwzG44Li473au5b32jhw6VK2ZMTcZBWAo2f4kl5zLOgpMwKM1Cb6s8b /StrGFRLmd0= =5gXR -----END PGP SIGNATURE-----