KeyPurpose

Sys Req

PrtSc

Home, End,

PgUp, PgDn

← − → ↓

Ins

Produces the system request function in certain applications.

Prints the screen display on a dot-matrix printer

Control cursor location in some applications, such as word processors, game programs, and spreadsheets.

Turns the insert function on and off in some application programs.

Del

Deletes the character at the cursor position

The Num Lock, Scroll Lock, and Caps Lock keys work as toggles; press the key once to turn on a function and again to turn it off. When the function is enabled, the corresponding light on the top right comer of the keyboard is on. When the function is disabled, the light is off.

Figure 3-2. Keyboard LED

3-4 Using Your Computer