NSTextField - can it have a keyDown / keyUp or mouse events - If not what c

I'm new to Apple Developement
What specifically I am trying to do is have 4 NSTextField or other text boxs that can
1. store into
2. read out
3. key into
4 alert App that one of the boxes have changed.
The fields would be decimal values and all of the boxes have to be recalculated if one were to change
Project: Cocoa Applicaion
Class: Cocoa->C class
Using Aaron Hillegass book - Cocoa programming for MAC OS X 3rd edition chapter 19
The text fields don't FirstRespond, but the CustomView does can I make he customview fill my requirements
Thanks in advance
Getting the

A worthy note - NSTextField only works on "keyUp" not "keyDown"
and it sure is picky on Class types NSView only??
So with that in mind the problem is solved.
Thank you

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I hope that this makes sense to those who read it. If, it doesn't then, please - someone say so. In case some of you recognize my monicker it has been a good while since I visited and asked for help.
Kappy, I didn't understand everything - had some health issues thus, I couldn't followup?
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