- Many times the term <kbd class="mouse">context-click</kbd> is used to indicate
- that you should (typically) right-click on a particular element of the graphical
+ Some GUI elements can optionally be controlled with the mouse wheel when
+ the pointer is hovering over them. The notation for mouse wheel action is
+ <kbd class="mouse">⇑</kbd> <kbd class="mouse">⇐</kbd>
+ <kbd class="mouse">⇓</kbd> <kbd class="mouse">⇒</kbd>.
+</p>
+
+<h4>Context-click</h4>
+<p>
+ The term <dfn>context-click</dfn> is used to indicate
+ that you should (typically) <kbd class="mouse">Right</kbd>-click on a particular element of the graphical