I wasn't very clear with my first posting on this subject, sorry about
that. For reference my first message read;

"Can I stop the use of the up\down cursor key press to move between
fields (next\previous). If I have a long field (well multiple lines) I
would like the up\down key press to move between lines in the field only."

What I failed to mention was that the fields in question are form fields
(mainly text) in a protected word 2000 document.

I was very kindly posted the following code, which unfortunately doesn't
seem to work with this case (thanks to Jay F)

Private Sub TextBox1_KeyDown(ByVal KeyCode As _
    MSForms.ReturnInteger, ByVal Shift As Integer)
    With TextBox1
       Select Case KeyCode
       Case vbKeyDown
          If .CurLine = .LineCount - 1 Then
             KeyCode = 0
             Beep   ' optional
          End If
       Case vbKeyUp
          If .CurLine = 0 Then
             KeyCode = 0
             Beep
          End If
       Case Else
       End Select
    End With
End Sub

Again sorry for the mess I made with the original posting - hope
somebody (maybe Jay?) can help :)

Thanks