How do I add the target dir to an registy key ?
- so i can read runtime where i'm installed (when im a service)

a) one guess is that i need to write a function in an installer class that i
can call, and that it will write to the registry.
b) i need to make a macro that i call during installation

For both of them how do i get ahold of the TargetDir that i want to place in
the registry and how do i call the funtion from the installer ?