This part of ISO/IEC 10026 provides

• a statement (clauses 6 to 11) of the nature of the automaton giving the necessary behaviour of each of the participating entities which are providing the OSI TP Service, covering
• the actions to be taken on receiving request and response primitives issued by a TP Service user invocation;
• the actions to be taken on receiving indication and confirm primitives issued by the presentation service-provider ;
• the actions to be taken as a result of certain events within the local system;
• the actions to be taken as a result of interactions with other ASES;
• the definition (clause 12) of the abstract syntax required to convey the TP protocol control information;
• the conformance requirements to be met by implementations of this protocol (clause 13).

The scope of this pari of ISO/IEC 10026 is limited to the interconnection of systems; it does not specify or restrict the implementation of possible interfaces within a computer system.