VB.NET service in a clustered environment

[Mr.No]

Hi

I have a windows VB.NET service that works perfectly on a normal standalone server. However when installed in clustered environment (2 machines) it seems to be fired twice.

I initiate a timer in the OnStart event and when a particular file is detected in a specific folder I execute some actions. It appears that both machines attemt to start the action since I get two log entries for the start action. Is there any special code I should include in my service to silently exit of the service has already started by the second machine of the cluster, may be something similar to

If App.PrevInstance Then
    Exit Sub
 End Sub

that I would include in a VB6 executable.

Thanks