<div class="content" name="ICapabilitySupport" uuid="f0bcaa1f-066a-42de-b052-82a1327c0e07"><p>The ICapabilitySupport <a href="3f01a312-3391-4109-a96e-95358babf191#gt_95913fbd-3262-47ae-b5eb-18e6806824b9" data-linktype="relative-path">interface</a> provides methods
for starting and stopping optional, dynamically controllable, catalog-related
capabilities of a COMA server. This version of COMA defines one such
capability, <a href="0ef29c3e-9405-49c6-9486-80e427ef1e30" data-linktype="relative-path">instance load
balancing (section 1.3.9)</a>. This interface inherits from <a href="../ms-dcom/2b4db106-fb79-4a67-b45f-63654f19c54c" data-linktype="relative-path">IUnknown</a>,
as specified in <a href="../ms-dcom/4a893f3d-bd29-48cd-9f43-d9777a4415b0" data-linktype="relative-path">[MS-DCOM]</a>
section 3.1.1.5.8.</p><p>To receive incoming remote calls for this interface, the
server MUST implement a DCOM Object Class with the <a href="3f01a312-3391-4109-a96e-95358babf191#gt_e433c806-6cb6-46a2-bb95-523df8818c99" data-linktype="relative-path">CLSID</a> CLSID_COMAServer,
specified in section <a href="3afd05f6-01a3-4920-951f-f9c703a3b0f1" data-linktype="relative-path">1.9</a>,
using the <a href="3f01a312-3391-4109-a96e-95358babf191#gt_c4813fc3-b2e5-4aa3-bde7-421d950d68d3" data-linktype="relative-path">UUID</a>
{47CDE9A1-0BF6-11D2-8016-00C04FB9988E} for this interface.</p><p>This interface includes the following methods beyond those
of IUnknown.</p><p>Methods in RPC Opnum Order</p><table><thead>
  <tr>
   <th>
   <p>Method</p>
   </th>
   <th>
   <p>Description</p>
   </th>
  </tr>
 </thead><tbody><tr>
  <td>Start</td>
  <td>Starts instance load balancing. Opnum: 3</td>
 </tr><tr>
  <td>Stop</td>
  <td>Stops instance load balancing. Opnum: 4</td>
 </tr><tr>
  <td>Opnum5NotUsedOnWire</td>
  <td>Reserved for local use. Opnum: 5</td>
 </tr><tr>
  <td>Opnum6NotUsedOnWire</td>
  <td>Reserved for local use. Opnum: 6</td>
 </tr><tr>
  <td>IsInstalled</td>
  <td>Determines whether instance load balancing support is installed. Opnum: 7</td>
 </tr><tr>
  <td>IsRunning</td>
  <td>Determines whether instance load balancing is running. Opnum: 8</td>
 </tr><tr>
  <td>Opnum9NotUsedOnWire</td>
  <td>Reserved for local use. Opnum: 9</td>
 </tr></tbody></table><p>In the previous table, the phrase &#34;Reserved for local
use&#34; means that the client MUST NOT send the <a href="3f01a312-3391-4109-a96e-95358babf191#gt_e127848e-c66d-427d-b3aa-9f904fa4ada7" data-linktype="relative-path">opnum</a>, and the server
behavior is undefined since it does not affect interoperability.<a id="Appendix_A_Target_348"></a><a aria-label="Product behavior note 348" href="022303e7-5044-4e20-8024-30dc89bb5f69#Appendix_A_348" data-linktype="relative-path">&lt;348&gt;</a></p><p>All methods MUST NOT throw exceptions.</p></div>