Function WithInField(Rng As Word.Range) As Boolean
' Based on code by Don Wells: http://www.eileenslounge.com/viewtopic.php?f=30&t=6622
' Approach  : This procedure is based on the observation that, irrespective of _
              a field's ShowCodes state, toggling the field's ShowCodes state _
              twice collapses the selection to the start of the field.
Dim lngPosStart As Long, lngPosEnd As Long, StrNot As String
WithInField = True
Rng.Select
lngPosStart = Selection.Start
lngPosEnd = Selection.End
With Selection
  .Fields.ToggleShowCodes
  .Fields.ToggleShowCodes
  ' Test whether the selection has moved; if not, it may already have been _
    at the start of a field, in which case, move right and test again.
  If .Start = lngPosStart Then
    .MoveRight
    .Fields.ToggleShowCodes
    .Fields.ToggleShowCodes
    If .Start = lngPosStart + 1 Then
      WithInField = False
    End If
  End If
End With
End Function

Sub TestWithInField()
Dim Rng As Word.Range, c As Word.Range, StrRslt As String
Set Rng = Selection.Range
For Each c In Rng.Characters
    StrRslt = StrRslt & c.Text & ",WithInField:" & WithInField(Rng:=c) & vbCr
Next
Rng.Select
MsgBox StrRslt
End Sub