Apple Macintosh PowerBook 145 - Manual (Page 65)

Using the keyboard
You use the keyboard to type text and numbers, just as you
would on a typewriter. (For touch typists, your keyboard has
raised dots in the middle of the D key and the K key to help
position your fingers on the home row.)
Depending on the program you’re using, you can use special
keys on the keyboard to give commands to the computer and to
modify certain things that you do with the trackball. Macintosh
PowerBook computer keyboards have two types of special keys:
modifier keys and arrow keys.
Modifier keys
All Macintosh keyboards have four modifier keys: Shift,
x
(Command), Option, and Control.
Pressed by itself, a modifier key does nothing. You need to press
it in combination with another key (or while using the trackball).
The modifier key causes the other key or trackball to give a
different (“modified”) result.
You type a capital letter, for example, by pressing the Shift key
with a letter key. Most programs let you choose commands by
pressing the x key with certain letter keys.
Arrow keys
All Macintosh keyboards have four arrow keys: Up Arrow, Down
Arrow, Left Arrow, and Right Arrow.
Many programs let you use the arrow keys as well as the
trackball to move the pointer on the screen.
shift
ctrl option
shift
Modifier keys Arrow keys
Chapter 2: Working on the Desktop 49