 The <code>groupName</code> of the stream's group.
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<td class="paramSpacer">&nbsp;</td>
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<td width="20px"></td><td><code><span class="label">p_recipientIDs</span>:Array</code> (default = <code>null</code>)<code></code></td>
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<a name="notifyCancelControl()"></a>
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<td class="detailHeaderName">notifyCancelControl</td><td class="detailHeaderParens">()</td><td class="detailHeaderType">method</td><td