It's possible to attach to explorer.exe and spy elements of the Windows desktop. Such an object could, for example, be used to periodically press the Windows start button to keep a screen lock away. It's a nasty solution, but it works if you have no other choice. I would only recommend it for the short term however, getting the screen saver disabled is by far the better option.
Phillip - sounds like your client has not yet fully bought into the concept of Digital Workforce, where new non-human rules apply. Keep working on them!!