Oh dear, perhaps I should have read through the previous posts before posting this one
Dmitriy posted a question on 20th August 2003 entitled Windows NT service and Icon in the System Tray
where he provided a link to vbCity.com
that describes what is involved in Creating WinNT Services in VB
. The article discuses how to create a service using VB6 (or 4 or 5), how to put an icon in the system tray and how to interact with it and how to turn the screen saver on or off.
If anyone has anything else to add then I would be very interested to know the details.