I have a two beer fridges which probably wont help unless I can bribe someone to come round and teach me for beer

I did download the data sheet and the interrupts sit on the RB pins as you thought. Having never used interrupts in my life I'm doing the time honoured way of trying to find some code that works as an example then break and see why it works. I'm not looking for a free ride I just need to get my head around how they work.
From what you say If i need to act on three seperate pins I'll need to have three seperate interrupts on the three pins.

Makes sense I just need to read and ask more questions

Rob