10. MODIFICATION › 10.2 Program Modification and Extension

Previous Topic: VMTFDEF VMTXMIT File Definition Exit Example 2

Next Topic: 10.2.1 Modifying Distributed Code

10.2 Program Modification and Extension


The VM Data Transfer Program is constructed so that functions
are modularized.  The input, output, and data selection
modules are loaded dynamically, based on parameters passed to
VMTXFR.  The distributed modules allow for disk and tape
input and output, VM Monitor data input from spool, VM
Account data input from spool, and card image output to
spool.  These modules can be replaced if an alternate input
or output medium is used.  All these modules have a calling
protocol, and return information in a standard manner.

The data selection module provided operates with VM Account,
CA VM:Account, VM Monitor, VM network, VM and VSE error
recording, and VSE/POWER Account data.  If you need to edit
other data, you can create a data selection module.

The following sections list procedures for modifying
distributed code and describe the main protocols and
functions of the VM Data Transfer Program.

      1 - Modifying Distributed Code
      2 - Protocols and Functions