IBM provides some APIs that let specific system functions be performed from within a program, as opposed to, for example, from the iSeries Navigator GUI. And sometimes IBM provides new APIs through a PTF, so that the API becomes immediately available for current or previous releases.
Today’s API by Example covers an API that falls into both categories: Change IPv4 Interface (QTOCC4IF). This API, part of the V5R4 base install and available to V5R2 and V5R3 through a couple of PTFs, lets you change selected parameters for an IPv4 network interface.
The V5R2/V5R3 versions of this API support only a subset of what’s available in the V5R4 API. This fact is revealed by comparing the documentation in the V5R4 Information Center with the documentation in APAR 19172.