Chapter 4. Communications applications
Communications applications that are used in an APPC (advanced
When you encounter problems that indicate that the route to the remote location cannot be found, you can attempt to make the connection again with the Start
For information on Connecting Windows 95/NT Clients to your AS/400, see Client Access.
User written APPC applications
APPN performs many functions in a communications environment. Therefore, it is important to consider
APPN function is transparent to APPC programs using APPN take advantage of the following routing functions:
v
vPerformance is improved for APPC programs with session endpoints that are not physically adjacent in the network.
vAPPC programs may communicate directly to programs in nodes in an adjacent APPN network through network nodes.
Distributed data management (DDM)
DDM is a function of the operating system that allows an application program or user on one system to use database files stored on remote systems. The systems must be connected by a communications network, and the remote systems must also be using DDM.
DDM on the AS/400 allows application programs or users to:
vAccess data files that reside on remote systems (target systems). The remote systems can also access data files on the local AS/400 system.
vAn application can add, change, and delete data records in a file that exist on a target system.
vCreate, delete, or rename files on a remote system.
vCopy a file from one system to another.
When DDM is in use, neither the application program nor the program user needs to know if the file that is needed exists locally or on a remote system. Remote and local file processing are essentially handled the same way.
Application program interface (API) performance considerations
To achieve better performance with your AS/400, you need to consider the application programming interface (API) available on the AS/400. To optimize APPC performance, consider the following:
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