gtpm1m2p | TPF V4R1 Migration Guide: 3.1 to 4.1 |
TPF Advanced Program-to-Program Communications (TPF/APPC) is an
interface that allows TPF transaction programs to communicate with remote SNA
nodes that have implemented the APPC interface using LU 6.2
protocols. In the TPF 3.1 system, the function provided by the
TPF/APPC interface was a subset of the IBM APPC architecture in that it
did not provide all the base functions defined by the LU 6.2
architecture.
In the TPF 4.1 system, TPF/APPC support includes the following
base functions:
- Parallel sessions
- Local and remote initiation of change number of sessions (CNOS)
- Mapped conversations (IBM C language interface only). The support
for mapped conversations is based on the CPI Communications. For
additional information and details on the C language functions, see the TPF C/C++ Language Support User's Guide.
- TPF/APPC session initiation with ALLOCATE requests.
- Note:
- There is one exception to this: PU 2.1 secondary LU (SLU) thread
sessions cannot be activated from the TPF side.
- Limited resource sessions
- LENGTH and DATA parameters. The function of the LENGTH and DATA
parameters exists in the TPF 3.1 system. However, the
implementation in the TPF 4.1 system is enhanced. In the TPF
4.1 system, the LENGTH and DATA parameters are available on the RECEIVE
and SEND_DATA verbs and the LENGTH parameter is available on the
POST_ON_RECEIPT verb. These enhancements allow you the
flexibility of specifying where the data resides.
TPF/APPC also supports some of the optional functions defined by the LU
6.2 architecture, including:
- GET_TYPE verb
- CNOS CHANGE function
- ALLOCATE with RETURN_CONTROL=IMMEDIATE.
In addition, TPF/APPC support provides:
- A programmed operator interface for CNOS support that allows you to write
user-supplied programs to control and maintain session limits
- A TPF command interface to drive the CNOS programmed operator interface so
that you are not required to write programs to control and maintain session
limits.
ROUTC extensions are no longer supported in the TPF 4.1
system. TPF/APPC must be used for LU 6.2
communications.
See the TPF ACF/SNA Data Communications Reference
for information about how to use TPF/APPC support in the TPF 4.1
system.