Capture ENTER key on numeric keypad

I have several chemistry tutorials where users type something and then have it evaluated by pressing the ENTER key. This works fine for the ENTER key on the main part of the keyboard, but does not work for the ENTER key for the numeric keypad on keyboards with the two ENTER keys. How do I capture the ENTER key on the numeric keypad? In other words, how do I do the equivalent of the following for that key?  
if the key = RETURN then
Thanks

Try checking:
if _key.keyCode = 36 then ...

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