Neither gotfocus nor activate do not fire when you swith between apps.
One solution would be using API Window relating functions.
The other way is to set keypreview of your form to True, intercept Alt/Tab in Form_KeyDown event and set focus to your policy number field in this event. I did not figure out how to intercept the combination but for the Alt key it should like that:
Option Explicit
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
Dim blAltDown As Boolean
blAltDown = (Shift And vbAltMask) > 0
If blAltDown Then
txtPolicy.SetFocus
End If
End Sub
Private Sub Form_Load()
Me.KeyPreview = True
End Sub
vladk