Sony PCG-R505TSK manual Key Description, Such as addition and subtraction. Note the following

VAIO® R505 SuperSlim Pro™ Notebook User Guide

The Notebook Keyboard Keys

Key	Description
Numeric keypad	The numeric keypad area contains the keys found on a typical calculator.
area	Use this area to type numbers or to perform mathematical calculations
	such as addition and subtraction. Note the following:
	•	To activate the numeric keypad, press the Num Lock key, which causes
		the Num Lock light to come on and remain on until the numeric keypad
		is deactivated.
	•	To deactivate the Num Lock key, press the Num Lock key again, which
		causes the Num Lock light to go off.
Navigation keys	The Left/Right/Up/Down arrows are devoted to move the cursor on the
	screen and also function as the Home, End, Page Up, and Page Down
	keys, respectively.
Correction keys	The Insert, Backspace, and Delete keys enable you to make corrections in
	your documents.
Function keys	The 12 function keys along the top of the keyboard are used to perform
	designated tasks. For example, in many applications, F1 is the Help key.
	The task associated with each function key may vary from one
	application to the next.
Escape key	The Esc (Escape) key is used to cancel commands.
Print Screen key	The Print Screen key takes an electronic snapshot of the screen and
	places it in the Windows Clipboard. You can then paste the screen shot
	into a document and print it.
Operator keys	Several keys are always used with at least one other key: Ctrl, Alt, and
	Shift. When held down with another key, the Ctrl (Control) and Alt
	(Alternate) keys offer another way to give commands. For example, in
	many applications, instead of choosing the Save command from a menu,
	you can hold down Ctrl and press S (referred to as Ctrl+S). The Shift key
	operates the same way as on a typewriter; it is used to produce capital
	letters or special symbols such as @ and $.
Windows key	The key with the Windows logo displays the Windows Start menu; it is
	the equivalent of clicking the Start button on the task bar. See
	“Indicators” .
Fn key	The Fn keys at the left and right sides work the same and are used in
	combination with other keys to issue commands. See “The Fn Key in
	Combination with Other Keys” .
Applications key	The Applications key displays a shortcut menu of context-sensitive
	choices; pressing this key is the equivalent of clicking the right mouse
	button.

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