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<meta name="abstract" content="This topic introduces the operating environments that i5/OS APIs exist on a system." />
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<h1 class="topictitle1"> API environments</h1>
<div><p>This topic introduces the operating environments that <span class="keyword">i5/OS™</span> APIs exist on a system.</p>
<p><span class="keyword">i5/OS</span> APIs exist in
several operating environments on a system.</p>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="opmOverview.htm">APIs for the Original Program Model environment</a></strong><br />
This topic describes the naming conventions of Original Program Model (OPM) APIs, the initial APIs on the system.</li>
<li class="ulchildlink"><strong><a href="ileOverview.htm">APIs for the Integrated Language Environment</a></strong><br />
The Integrated
Language Environment<sup>®</sup> (ILE) model is a set of tools and associated system
support designed to enhance program development on a system.</li>
<li class="ulchildlink"><strong><a href="ileCEE.htm">APIs for the ILE Common Execution Environment</a></strong><br />
The ILE APIs with names beginning with CEE are based on the SAA<sup>®</sup> language
environment specifications. These APIs are intended to be consistent across
the IBM<sup>®</sup> systems.
CEE APIs with names beginning with CEE4 or CEES4 are specific to business
computing systems.</li>
<li class="ulchildlink"><strong><a href="opmIlecompare.htm">OPM and ILE API differences</a></strong><br />
This topic gives an overview of how Original Program Model (OPM)
APIs and Integrated
Language Environment<sup>®</sup> (ILE) APIs differ from each other. The ILE APIs
include the UNIX-type APIs and the ILE CEE APIs, among others.</li>
<li class="ulchildlink"><strong><a href="unixType.htm">APIs for the UNIX-type environment</a></strong><br />
The interfaces provided by sockets, the integrated file system, and other categories are part of a continuing emphasis on supporting an open environment on the system.</li>
</ul>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="concept.htm" title="Describes the underlying concepts that you need to understand to work effectively with APIs. Among the concepts covered are basic concepts, programming considerations, and terminology.">API concepts</a></div>
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