Risc OS Books

I am relatively new to Risc OS, and I would like to study the OS. Are there any books written that discuss the system in general. Or any documentation that explains the OS. I am looking for something a little more complicated than how to use it.

Thanks Bob

That would be the Programmers Reference Manuals. You realy need this if you want to do anything with RISC OS.

You can download the PRMs as per the instructions at: http://www.drobe.co.uk/riscos/artifact1688.html