FUNCTION KEYS

Function keys alter the way other keystrokes or mouse clicks are interpreted.

Help

Pressing the Help key opens the OS X Help Viewer for some applications. Sometimes
pressing it does nothing. Not all keyboards have this key. It is sometimes also labelled
"ins".

Forward Delete

This is another Delete key and is sometimes labelled del. This key deletes the
character immediately following the cursor and is only found on desktop keyboards
(i.e. not laptops).

Home

The Home key is primarily used in text editing applications to return the caret (the
blinking vertical line) to the beginning of the line that the caret is on. When the text
is not editable, the Home key is used to return to the beginning of the document,
but does not move the caret.

End

The End key is primarily used in text editing applications to return the caret (the
blinking vertical line) to the end of the line that the caret is on. When the text is not
editable, the End key is used to return to the end of the document, but does not
move the caret.

Page Up Page Down

Page Up/Down scrolls up/down a page without moving the caret (the blinking vertical
line). Using the option key will cause the caret to be moved. When used with Shift it
will create a selection. The scrolling distance varies between different applications.
In cases when the document is shorter than needed, the Page Up/Down keys don’t
respond.

Eject

This key is self-explanatory. It ejects CDs or DVDs from slot and tray loading drives.
With tray loading CD/DVD drives it both opens and closes the drive bay.

Power

The power button turns your Mac on. If the computer is already running, pressing
the power button accesses the restart, sleep, cancel and shutdown dialog box, or will
cause the computer to sleep or wake. If held down for 5-10 seconds it will force your
Mac to crash/turn off.

Function Keys

Function keys are labeled “F” followed by a number, for example “F2”. These keys
are found within the row of keys across the top of the keyboard. Macintosh laptops
have F1 through F12 only. Most other Macintosh keboards have F1 through F15.

fn Key (laptops only)

The fn key is found on laptops only. Its purpose is to give the user access to the
Function keys (see Function Keys) that are by default, control buttons for the
display, sound, number lock and disk drive.

num lock

The num lock key pertains only to laptops. This key is a toggle key and is also
labelled F6. When num lock is on, the embedded keypad is activate. If you look closely
at your laptop keyboard you will see small numbers and symbols painted on corners of
17 of the middle-right keys.