Set/toggle CAPS-LOCK from a Microsoft Service on XP/VISTA

[Tom]

I have a basic XP service that runs fine and is set to autostart (written in
C..). I need to set/toggle the CAPS-LOCK from the XP service. All
typical/documented methods that I have found work great in an application
but do not work within a service. I suspect because a service typically
doesn't need to access the keyboard. I've tried some attempts to access
the KB without luck. Any help would be greatly appeciated. Also need a
basic VISTA template so I can update my Service for some Vista clients. No
other 'touching' of the keyboard is required in the service at any other
time.

Also, yup, understand this is a bit unusual.......

Also, if this is not the right area to post this question I'd appeciate a
point in the right direction.