>>Hi George,
>>Another (very simple) approach is to pass a parameter (anything) to your Exe. In the NT4 Services dialogue there is a text box at the bottom of the window parameters. No parameter = visible.
>
>Hmmm, I've never noticed this. I'll have to take a look at it. But, this will only work when starting up the service, correct?

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Yes.
You will probably have to rely on the presence of a file to determine visibility thereafter.