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      <title>MB3 Options Overview</title>
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      <div class="title_topic3" id="xps10_pagetitle">MB3 Options Overview</div>
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      <p class="para_topic">The third mouse button (MB3) may be used while highlighting any object in any view of the Operation Navigator to display drop down menu options. These options allow you to perform a variety of functions on operations and groups. Many of these options are also available in the main menu and tool bar. Holding down the Shift or Control key allows you to select multiple objects.</p>
      <p class="para_topic">In most cases, using MB3 requires that you not be currently editing an operation. In such a case, the menu options are grayed out. Each of the MB3 options are described below.</p>
      <p class="para_topic">The MB3 options are context sensitive. This means that if an option is not applicable to what you have right clicked on, the option will not appear in the pop-up menu.&nbsp; This makes the pop-up menu easier to use because it only provides the actions applicable for the current selection, therefore offering less options to browse through. </p>
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