Question: Given the code below:

```js
function test() {
    document.forms[0].TEST[0].focus();
}
```

```html
<form>
    <input type="button" value="Test" onclick="test()" />
    <input type="radio" name="TEST" value="A">A
    <input type="radio" name="TEST" value="B">B
</form>
```

In IE6, clicking the button doesn't focus the control, unless I've already tabbed through the radio at least once, in which case it works. =/

Any idea how I should be focusing the control? The above works perfectly fine in FF of course.

Edit: I found that the control is being focused, except the highlight box around the radio button is not being rendered. (I can hit space to activate the radio button, and also use arrow keys to change the active button). So the question becomes: how can I force the focus highlighting box to render?

Answer: 
I would design an application as a service if the applcation has a critical purpose and should never (or rarely) be closed. Windows services provide good crash-recovery options, good notifications (see the recovery tab in service property).

Also a good reason to use services is because they can run under any user ( so if you 
deploy them on a server that you remote to, you can safely log out after starting the service without worring that the application will close too).

I also design services in combination with a desktop application that can interact with the service and can be used to monitor or reconfigure the service while running. This way you can have all the benefits of a tray application, in your service.

However, you should not abuse using services and only use them, as I said, for cirtical applications.
I believe your decision is almost right, however, I would add one more condition. Take for example the mysqld service (you have a choice in this case, but most people run it as a service). It's ran as a service because you want to access the service anytime through potentially multiple applications. It's important that it is responsive to all applications calling upon it, and itself, is not much of anything, other than waiting to serve other applications.

Just something I would consider as well when making my decision.