The buttons

0 to 9Input digits
. or ,Decimal separator
<-Removal of last input: digits, decimal separator or operator
ACClear all: both input and result area
or $Validation of input number considered as a value expressed in the reference currency (euro)
The button labeled with the name of an other currencyValidation of input number considered as a number in the other currency
EnterValidation of input number considered as a simple, unitless, value
%Validation of input number considered as a percentage
+/-Change sign of the result
Min, MR, M+ and -Store result in memory, recall memory into result, add result to memory and subtract result from memory
/, X, - and +Operators: addition, subtraction, multiplication and division
ResetReset both input, result and memory
AboutDisplays the About box
HelpDisplays these help pages
The drop down list with currency codes and namesSelects an other currency to work with