One is a drive mode (single-frame, multiple-continuous frame shooting- is what you are looking for, self-timer with multiple choices with the 2-second version having the mirror locked up, and more choices). drive mode selections are accessed via the button above the ok button.
The other feature you are alluding to is via the switch on the left side of the camera- AF-C, which is for continuous AF tracking. With this setting, the AF continues to re-focus as a subject moves, as you hold the half press or use the rear AF button. In this AF mode, the shutter will fire even though "perfect" focus may not be achieved, whereas with AF-S the shutter will fire only when the focus confirmation light comes on.
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