In a program how do you program the ENTER key

[WDTau]

I am trying to write a simple program that changes the number of displayed decimal places on the stack to 3 with the minimum amount of user keystrokes but I cannot work out how to program the "ENTER" key so that you don't need to manually press the ENTER key on the calculator to get the program to run to completion.

The program is:-

Export FIX3()
BEGIN
3 ▶ HDigits
END ;

Any assistance would be greatly appreciated.