Editing OSI protocols (section)

==Layer 5: session layer==
* Session service – [http://www.itu.int/rec/T-REC-X.215/en/ ITU-T Rec. X.215 <nowiki>[ISO/IEC 8326]</nowiki>]
* Connection-oriented Session protocol – [http://www.itu.int/rec/T-REC-X.225/en/ ITU-T Rec. X.225 <nowiki>[ISO/IEC 8327-1]</nowiki>]
* Connectionless Session protocol – [http://www.itu.int/rec/T-REC-X.235/en/ ITU-T Rec. X.235 <nowiki>[ISO/IEC 9548-1]</nowiki>]
The session layer controls the dialogues (connections) between computers. It establishes, manages and terminates the connections between the local and remote application. It provides for full-duplex, and half-duplex or [[Simplex circuit|simplex]] operation, and establishes checkpointing, adjournment, termination, and restart procedures. The OSI model made this layer responsible for graceful close of sessions, which is a property of the Transmission Control Protocol, and also for session checkpointing and recovery, which is not usually used in the Internet Protocol Suite. The session layer is commonly implemented explicitly in application environments that use remote procedure calls.