ISO Development Environment
The ISODE software ( pronounced eye-soo-dee-eee ) , more formally the "ISO Development Environment" , was an implementation of the OSI upper layer protocols , from transport layer to application layer , which was used in the Internet research community to experiment with implementation and deployment of OSI during the late 1980s and early 1990s . 
<triplet> OSI <subj> application layer <obj> has part <triplet> upper layer protocols <subj> application layer <obj> has part <triplet> application layer <subj> OSI <obj> part of <subj> upper layer protocols <obj> part of