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VB code:
Option Explicit

Private Sub Form_Load()
Timer1.Interval = 50
End Sub

Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer)
Static i As Long
If KeyCode = vbKeyReturn Then
If i Mod 2 = 0 Then
Text1.Locked = True
i = i + 1
Else
Text1.Locked = False
i = i + 1
End If
End If
End Sub

Private Sub Timer1_Timer()
Text1.SetFocus
End Sub



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VB code:

Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer)

If KeyCode = vbKeyReturn Then

Text1.Locked = Not Text1.Locked

End If
End Sub



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