How do I define the number of decimal places for my currency?

How do I define the number of decimal places for my currency?

Go into File>System Configuration>System Settings and locate field Currency Decimals.  By default this is set to 2 but you can amend it to provide any number of decimal places up to 6.   You should note that this affects only Unit Prices.  I.e. Any calculated extended Prices (Unit Price * Qty) will still be displayed to 2 decimal places