"Stream Control Transmission Protocol" complements TCP and UDP. Useful reading includes "SCTP for Beginners" [L1 ], the Wikipedia page [L2 ], RFC 2960 [L3 ], a Networksorcery explanation [L4 ] and http://www.sctp.de/ .
Here are two important facts about SCTP:
The big question for Tclers is whether Tcl deserves an SCTP-savvy extension. Is ceptcl a good location?