If you have a full keyboard you can use the pgup and pgdown keys on your keyboard, near the numpad.
If you are not using a full keyboard, function, labeled fn on your keyboard, plus the up and down arrow keys will give you a page up and down.
System Administrators Blurb
If you have a full keyboard you can use the pgup and pgdown keys on your keyboard, near the numpad.
If you are not using a full keyboard, function, labeled fn on your keyboard, plus the up and down arrow keys will give you a page up and down.