These resources are by no means complete, yet they can serve as a basic learning resource for people interested in developing some practical knowledge oriented toward plugin development for Caligari related software application extensions commonly known as plug in addons that extend the functionality of Caligari 3D modeling software. It is aimed at educating average users about what's involved in TSX and RSX plugin requirements based on your softwares current SDK documentation. Interested members are encouraged to add new information relevant to the topic. I found very little specific information about this topic through existing resources. What I did learn is that the basic requirements for writing these plugins falls in the realm of computer programming knowledge.
Wikipedia's, general explanation about plugins and their purpose.
Microsoft's tutorial on how to write a simple plugin.