How to create a new tool or plugin?

[Fudgy]

I've written an "exe" program in MS Visual Basic that works on the active document inside Illustrator.
I have to start it as a stand-alone application, but it works fine.
I don't know how to embed it into Illustrator as a new tool or plugin.
Does anyone know (or have a reference to) instructions on how to do this?

Thanks!!

[LSR84]

For most of the softwares there is a so called SDK, a software developement kit. This tells you how to add more functions to a specific software. There is a SDK for Illustrator too. You can download it from the Adobe website.

http://partners.adobe.com/public/developer/illustrator/sdk/topic.html

Ciao!