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If it is your app that you want to test, use:<br />
If App.Previnstance Then<br />
&nbsp; &nbsp; 'There is already one instance running<br />
End If
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If it is your app that you want to test, use:
If App.Previnstance Then
    'There is already one instance running
End If

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Is it possible to know the Name of the Applications are running in the System ?.<br />
For Ex : I need to give Msg if they are running the application already.
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Is it possible to know the Name of the Applications are running in the System ?.
For Ex : I need to give Msg if they are running the application already.

To Know Running Application

Visual Basic is Microsoft’s event-driven programming language and integrated development environment (IDE) for its Component Object Model (COM) programming model. It is relatively easy to learn and use because of its graphical development features and BASIC heritage. It has been replaced with VB.NET, and is very similar to VBA (Visual Basic for Applications), the programming language for the Microsoft Office product line.