Thank you everyone for the great replies.
Obviously just getting my head around the modules. I am currently looking at the CM15 for PC control. (Note: Not sure if it makes any difference but I am in Australia).
Here is my idea for those interested:
Use a PC as the "main control". With the software that I am familiar with remote control via internet is very easy.
Press a button (1) on a 433MHz remote (KR22) open garage door.
Press button two, open electronics strike door.
Press button three, turn off the alarm system (SC28). However, was hoping to get rid of the SC28 and use the CM15 to disable and enable the alarm on the PC so status can be monitored over the internet, remotely.
I understand it can be done with one button and macros but sometimes you dont want everything to happen in the same order.
Was also hoping to control everything remotely, i.e open the front door for trades people etc.
I have a few motion sensors (MS18) and a few door sensors DS18. However, I think they use 433MHz as well. Not sure how to figure out what their house and unit code is. Was hoping that the V572A will receive the 433MHz convert to X10 send that to the CM15 and either rs232 or usb I can then "see" the format that it gets send and hopefully duplicate that with 3rd party software that I am very familiar with and receive all the motion and door open commands through the PC.
I can then use the motion sensor to start the video cameras, firewire, usb or firewire as they are cheaper than the ones X10 sells.
I currently have a bar where I can check inventory through the PC as I barcode scan all items in and out of the bar. Lots of fun and my mates constantly debug my beta attempts.
Please do not ask why,I do not really need any of this, I just really like automating things and pressing buttons.