"I work as a support developer for the trading desk at a fairly large bank," Jay P.L. writes, "some of the automatic trading systems used have grown organically from what can originally be called an Excel spread-sheet. However, the complexity can sometimes be overwhelming."

Jay continues, "When traders find functionality that doesn’t quite work as expected, our usual response is, 'just send over the spreadsheet and we'll take a look at it.' Cracking open the VBA and debugging through the issue usually finds the cause relatively quickly. Most of the time, the issue can be blamed on a close colleague who made the mistake during a particularly hectic trading atmosphere under an abundant amount of stress and pressure. These situations are usually overlooked and forgiven. The issue fixed and returned."

"Usually forgiven. Imagine my joy at finding the following code snippet."

Sub LogIn()
  On Error Resume Next
  Result = BatchLogin("jpl", "England1")
  If Err.Number <> 0 Then
    Err.Clear
    PassWordReset
  ElseIf Len(Result) = 0 Then
    PassWordReset
  End If
End Sub
 
Sub PassWordReset()
  With ThisWorkbook.VBProject.VBComponents.Item("DataBase")
    SecStr = .CodeModule.Lines(3, 1)
    SecArr = Split(Right(SecStr, Len(SecStr) - 22), ",")
    UserID = Replace(SecArr(0), Chr(34), "")
    With frmLogIn
      .txbUserId = UserID
      .Show
      If Len(.txbUserId) = 0 Then End
      UserID = .txbUserId
      Password = .txbPassword
    End With
    AppSts = Application.ScreenUpdating
    Application.ScreenUpdating = True
    Application.ScreenUpdating = AppSts
    On Error Resume Next
    Result = BatchLogin(CStr(UserID), CStr(Password))
    If Err.Number = 0 And Len(Result) > 0 Then
      q = Chr(34)
      .CodeModule.DeleteLines 3, 1
      On Error GoTo 0
      .CodeModule.InsertLines 3, _
          "  Result = BatchLogin(" _
          & q & UserID & q & "," _
	  & q & Password & q & ")"
    Else
      PassWordReset
    End If
  End With
End Sub

Jay adds, "I find the interesting point being the self-modifying VBA code, even though it can be enjoyed on so many levels."