LU 6.2 API Application Programmer's Reference Guide (30294-90008)

32 Chapter2

Conversations

Establishing Conversations

TP conversations can be locally initiated (initiated by the TP on the

HP 3000), or remotely initiated (initiated by the TP on the remote

system). This section describes the tasks that the local application

programmer, the node manager, and the remote application

programmer must perform in order to establish a locally or remotely

initiated conversation.

Locally Initiated Conversations

The following things must occur for a local TP to initiate a conversation:

1. An APPC session of the appropriate session type must be

established.

2. A local end user must run the local TP.

3. The local TP must send an allocate request over the session assigned

to it, to request a conversation with the remote TP.

4. The remote TP must be coded to receive the allocate request from

the local TP.

Note that the session must be established before the local TP can use it

to send the allocate request. This section describes the tasks that the

local application programmer and the node manager must perform in

order to establish a locally initiated conversation.

Local Programmer Tasks

To prepare for a locally initiated conversation, you must do the

following:

1. Work with the programmer on the remote system to design and code

the TP.

2. Ask the node manager for the name of an appropriately conﬁgured

session type, or ask the node manager to conﬁgure a session type for

the conversation. The session type must direct data to the remote

LU that serves the remote TP.

3. Code the name of the session type into the

SessionType

parameter

of the MCAllocate intrinsic.

Node Manager Tasks

To prepare for a locally initiated conversation, the node manager must

do the following: