Where can a user write to that can be accessed by a service when a user is logged off?

Where can a user write to that can be accessed by a开发者_如何转开发 service when a user is logged off? When a user runs the program they will be applying settings that a service needs to read, typically a user would need to be an administrator to be able to write to 'Program Files' or HKEY_LOCAL_MACHINE so is there a correct way to prompt for admin elevation at that point rather than running the program as administrator?

Many thanks Steven