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      <div class="title_topic3" id="xps10_pagetitle"> Open C and C++ API Programming Interface</div>
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      <p class="para_topic"> Four Open C and C++ API Exits provide programming access to the Modeling Spreadsheet function. These Open C and C++ API Exits allow you to insert additional functionality into the spreadsheet function.</p>
      <p class="para_topic"> The four environment variables for these User Exits are:</p>
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               <p class="para_td"> Variable</p>
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               <p class="para_td"> Description</p>
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               <p class="para_td"> USER_SPRD_OPN</p>
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               <p class="para_td"> Called when the spreadsheet process is first started, just after the communication link has been established, and special built-in functions installed.</p>
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               <p class="para_td"> USER_SPRD_CLO</p>
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               <p class="para_td"> Called when the function is terminated.</p>
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               <p class="para_td"> USER_SPRD_UPD</p>
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               <p class="para_td"> Called at the start of NX part update.</p>
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               <p class="para_td"> USER_SPRD_UPF</p>
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               <p class="para_td"> Called after part update is complete.</p>
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      </table><br><p class="para_topic"> One potential use for the USER_SPRD_OPN exit would be to add your own remote functions using the programming interface provided by the spreadsheet.</p>
      <p class="para_topic"> Refer to the  <em>Open C and C++ API Reference</em> Help for details on how to use these exits.  
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