User define key + auto ENTER

[cclinus]

Hello,

I want to create a user define key to run a program call ENG().
The key define program is :
KEY K_Mul()
BEGIN
RETURN "ENG(Ans)";
END;

This program work fine. "ENG(Ans)" is on the entry line when press the user define key.
Then I need to press ENTER to run it.
My question is: Is it possible to run the ENG() automatically. I mean no need to press ENTER.
Similar to C language: printf("This is a test /n") .

Thanks!