A "4 port remote powerboard" is a powerboard (I think they may be called powerstrips in the US) that has 4 power outlets that can be individually switched (The one I have is http://www.jaycar.com.au/productView.asp?ID=MS6150
I know that the frequency is 433.92 mhz and I have already got the receiver and transmitter for this frequency.
I have already seen the waveform generated by the current remote and can measure the timings but I am unsure of how to feed them back into the transmitter.
As far as I know the transmitter should take care of the modulation and I should just be able to feed the codes back into it.
I am not trying to make anyone read my mind and I thought I had explained my situation, hopefully I have cleared anything up now.
My original plan was to just press the buttons with the arduino but then I decided against it as it would be quite messy if I had multiple remotes for different boards all wired up as opposed to having a nice neat setup with a RF transmitter.