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&#160;<span id="projectnumber">3.6.1</span>
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<div class="headertitle"><div class="title">Environment Variables</div></div>
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<p>You will find here the environment variables that change the default behavior of the NATS C Client library. <br />
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<th class="markdownTableHeadNone">Name </th><th class="markdownTableHeadCenter">Effect </th></tr>
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<td class="markdownTableBodyNone"><b><code>NATS_DEFAULT_TO_LIB_MSG_DELIVERY</code></b> </td><td class="markdownTableBodyCenter">On <a class="el" href="group__library_group.html#ga4a26d4caecb23348f6eee862c95fee7d" title="Initializes the library.">nats_Open</a>, the library looks for this environment variable. If set (to any value), the library will default to using a global thread pool to perform message delivery. See <a class="el" href="group__opts_group.html#gabf060c92648b50c069f0abe7cbb06f1c" title="Switch on/off the use of a central message delivery thread pool.">natsOptions_UseGlobalMessageDelivery</a> and <a class="el" href="group__library_group.html#gab21e94ce7a7d226611ea2c05914cf19d" title="Sets the maximum size of the global message delivery thread pool.">nats_SetMessageDeliveryPoolSize</a>. </td></tr>
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