Photoshop programming

[Patience via Digitalmars-d-learn]

Photoshop has the ability to be controlled by scripts and 
programming languages. For example, C# can be used to access 
photoshop by adding the appropriate reference and using 
directives. I believe it is COM based but I am not totally sure.

I've tried reading the docs but it's not making much sense.

http://www.lunesu.com/uploads/ModernCOMProgramminginD.pdf

links at the bottom are down.

It says one has to create a wrapper, but then talks like it can 
be done automatically. I assume that is what project does? But 
then one has to create an idl, not sure what that is ;\

Any info on how to do this stuff properly?