NeoCal for Palm OS User Guide
NeoCal contains ten registers used specifically for the financial applications:
Just like the user registers, these registers are accessed using the and buttons. However, the financial registers perform a calculation when their button is pressed without being preceded by or . As a convenience, pressing one of these buttons while entering a number will cause any pending operation to be performed and then store that number in the register.
The financial registers and any user registers currently holding a cash flow entry are cleared by pressing the button. As a reminder, the value of the register is displayed.