Hi Alex, yes, one field is calculated on that form (it's a calculator - needed because it's a 8" touch-screen pad and the built-in keypads are too big); the other path is passed on from another form, so it deposits the calculated value to the right form (several forms will use the keypad form.)
In short touch the control on CustOrderF brings up the CalcF, when the ok on CalcF is pressed the value is passed back to the CustOrderF.
Hopes this makes sense!

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Reply from Alex Hedley:

I did something similar to this in a db a few years back.
I had a Form that I wanted to choose a value for (combo) and it opened up this helper Form.
I wanted to store which Combo had opened the Form so I created a hidden Field on the Helper Form (i.e. your Calculator) called txtReferrer.

Private Sub cboX_DblClick(Cancel As Integer)
    DoCmd.OpenForm "frmHELPER"
    Forms!frmCHOOSE!txtReferrer = "cboX"
End Sub

Then when I had chosen the value pass it back:
Private Sub cmdAddToCHOOSE_Click()
    Forms!frmY(txtReferrer) = YOURVALUE
    DoCmd.Close
End Sub

So the notation you need is
Forms!frmY(txtReferrer) = YOURVALUE

Do you see how it differs from FORMS!FORMNAME!FIELD instead its FORMS!FORMNAME(FIELD) WHERE (FIELD) can be a variable.

There is probably a better way but this worked at the time.