HP HP-UX SNAplus2, Administration Manual

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Chapter 1 39
SNA Terms and Concepts
Basic SNA Concepts
Figure 1-2 Multiple and Parallel Sessions
Conversations
This section applies to LU 6.2 only.
Once a session is established between two LUs, the LU-LU session
supports the exchange of information between two TPs, which have the
exclusive use of the session to execute a transaction. This exchange of
information is called a conversation. Only one conversation can use a
particular session at a time, but sessions are serially reusable (many
conversations can use the same session, one after another).
To initiate a conversation, a source TP sends a request to its LU, asking
it to allocate a conversation with a remote TP. The invoking TP (or
source TP) initiates the conversation, like the calling party in a
telephone conversation. The invokable TP or target TP (the remote TP) is
the partner in the conversation, like the party who receives a telephone
call.