We need to find out what behavior we expect from the Internet entities. We identify the building blocks of the various services, not the services themselves. The behavior is defined by how these blocks are put together to create services. Protocols are working in two directions or they are limited in usefulness. When the service asks an entity to do something, we expect that the entity being requested can perform said function.
Current terminology is problematic.
We need agreement in terminology first. That needs to be discussed the mailing list. They use information that comes in from an IN trigger. Trigger response may result in the setting of other triggers. Sequencing of messages may not be critical since there may not be as many messages in each case.