Nikon Camera N90 - Manual (Page 51)

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Single Servo AF with Focus-Priority
For Single Servo AF with Focus-Priority, set the focus mode to
S
You lightly press the shutter release button, the lens starts
adjusting for focus. Because the priority is on correct focus, the
shutter cannot be released until the subject is in focus. After
focus is achieved, the focus remains locked for as long as the
shutter release button is lightly pressed. This feature is useful,
especially when recomposing the picture with the mains
subject off center. However, if the camera-to-subject distance
changes, you have to refocus.
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