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82 Chapter 2
Introduction to SNAplus2
SNAplus2 Components
APPC API
An APPC application uses the node's LU type 6.2 resources to
communicate with another APPC or CPI-C application on a host or peer
computer, using a specified mode. The APPC API includes TP server
support, enabling applications to have greater control over starting
transaction programs (TPs) and distributing conversations to those TPs.
If the TP on the SNAplus2 computer is the invoking TP (the TP that
starts the APPC conversation), the additional node resources required
depend on the APPC features used by the TP, and on the type of remote
system it is communicating with:
• If the local node or the remote system with which the TP
communicates is a LEN node, you need to define directory entries for
the remote node and its LUs.
• If the TP specifies its local APPC LU using an LU alias, you need to
define the partner LU in order to associate this alias with a fully
qualified LU name.
• If the TP uses a dependent local LU to communicate with a host, you
need a partner LU definition on the local node that specifies the
uninterpreted name for the LU on the host. When the TP requests a
conversation from the local LU, the local LU sends the host a session
initialization request that contains the uninterpreted name for the
host LU.
In the Motif administration program, directory entries and partner LUs
are not shown explicitly, but are included under the “Remote Systems”
heading in the Node window for the local node.
If the TP on the SNAplus2 computer is the invoked TP (the TP that
accepts a conversation started by the invoking TP), the additional
resources required depend on the APPC features used by the TP, and on
how it is to be started:
• To restrict the TP to using particular options for conversation
security, confirm synchronization, or conversation type (mapped or
basic), or to restrict the number of instances of the TP that can be
running at any time, you must define the TP as a node resource.
• To start the TP automatically when another TP requests a
conversation with it, you must provide the information that
SNAplus2 needs to start the TP. For more information, see Chapter 7,
“Configuring APPC Communication.”