OverviewCtrl-click
Ctrl-clicking (pronounced "control clicking") is easy. To do it, you just press and hold the Ctrl key down while you click the mouse.
In AutoPlay Media Studio (as in Windows), you can ctrl-click to add individual items to your current selection. For example, ctrl-clicking on a list item will select that item in addition to any items that are already selected. Similarly, ctrl-clicking on an object will select that object in addition to any other objects that are already selected.
Normally, when you click on five items in a row, you select each of the five items separately, one at a time. But if you ctrl-click on five items in a row, each item is added to your selection, so you end up having all five items selected at once. (Having more than one thing selected at once is known as "multiple selection.")
Tip: You can subtract individual items from your current selection by ctrl-clicking on items that are selected; ctrl-clicking on a selected item will deselect that item (i.e. it will remove that item from the current selection).
Next: Shift-click