Article: Q160876
Product(s): Microsoft SNA Server
Version(s): WINDOWS:2.0,2.1,2.11,3.0,4.0
Operating System(s):
Keyword(s): kbnetwork kbprogramming
Last Modified: 12-JUN-2001
-------------------------------------------------------------------------------
The information in this article applies to:
- Microsoft SNA Server, versions 2.0, 2.1, 2.11, 3.0, 4.0
-------------------------------------------------------------------------------
SUMMARY
=======
APPC is a peer-oriented program-to-program API where either Transaction Program
(TP) can initiate a conversation. However, APPC/LU6.2 traditionally is
half-duplex, where after the conversation is established, only one TP has
direction to send on a conversation at a time. The state of the conversation, as
viewed by a particular TP, governs which APPC verbs can be issued by the TP at a
particular time. If the local TP views the conversation as being in a "send"
state, then the partner TP would also be in a send state.
IBM now supports "full duplex" APPC where either program can issue both send and
receive verbs at the same time, though this is a fairly new implementation of
APPC.
The following is the option to set for full duplex functionality:
112 -- Full-duplex conversations and expedited data
SNA Server does not support option set 112; it only supports half-duplex,
although either end can initiate the conversation.
MORE INFORMATION
================
See the "Conversation States" section of Chapter 2 of the SNA Server
Programmer's Reference for a thorough explanation of conversation state changes.
Additional query words:
======================================================================
Keywords : kbnetwork kbprogramming
Technology : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ200 kbSNAServ211 kbSNAServ400 kbSNAServ210
Version : WINDOWS:2.0,2.1,2.11,3.0,4.0
Issue type : kbinfo
=============================================================================