For this purpose, Bindevent is perfect!
In the textbox where you want the result, I call it txtResult, you have something like this in the Refresh:

This.value=this.parent.txtMyValue1.value + this.parent.txtMyValue2.value + this.parent.txtMyValue3.value

Add these lines to your form, for instance in the Gotfocus method:

Bindevent(thisform.txtMyValue1,"interactivechange",thisform.txtResult,"refresh")
Bindevent(thisform.txtMyValue2,"interactivechange",thisform.txtResult,"refresh")
Bindevent(thisform.txtMyValue3,"interactivechange",thisform.txtResult,"refresh")

Then whenever you change any of the values in txtMyValue1, txtMyValue2 or txtMyValue3, txtResult will also get updated.

>How do you experts implement form calculations? What I mean by this is, a form has several numeric fields and I want to make calculations based on these fields and display the results on the form, updating the results every time there is a change.
>
>When the form is displayed, it should calculate and display the results. When there are any changes in the numeric fields it should recalculate and display the results.
>
>In that I am not much of a programmer, the more specific the answer the better.
>
>Thanks.