 keys are joined by a plus sign and
modifier keys must be listed first, e.g. "Ctrl+A" or "Ctrl++".</p>

<h4><a name="modifiersettings">Modifier settings</a> <a href="#top">&uarr;</a></h4>

<ul>
    <li><b>Zoom</b> The keyboard modifiers to zoom using the mouse wheel in the main
view.</li>
    <li><b>Rotate</b> The keyboard modifiers to rotate using the mouse wheel in the
main view.</li>
    <li><b>Scroll</b> The keyboard modifiers to scroll horizontally using the mouse
wheel in the main view.</li>
    <li><