I was looking at the Curacao T4 pages today and noticed that RTI is offering composite video viewing when you're in Sat/CCTV/Tivo source. I also noticed that the video window on those pages vary in size. Sat is bigger than the tivo, and CCTV is bigger than the Sat. Anyone have any idea on how to make them larger?

What if I were to convert the Apple TV signal from component to composite and send that image to my T4? Right now, if I were to use the Sat Source, I would see the output from the apple on my T4, however, the image is too small. I'd like it bigger, like the entire screen size. I could control it by using the hard buttons (up/down/left/right/enter/ and menu). It's totally do-able, I just need to figure out how to make the video image larger. Can anyone help???

Do you mean T4 or K4? The K4 has 4 composite inputs which can be wired to be 2 S-Video inputs. Even though it is in the page wizard, to my knowledge you can not send a video feed into a T4, unless you have some type of video to ip converter and then make it a web page. They were suppose to bring out an inwall docking station that would add wired ethernet and video inputs when docked, but I don't believe they ever did. As far as changing the size, all you have to do is go into the properties of the button and change the size. Or you could just drag a side of the image if you so liked.

In Integration Designer (V.7.0.1), I added a Touch Screen, went into page wizard, under Curacao, and opened Cable /w Video Preveiw. I havn't done it yet, but I'm assuming it can be done, provided you use an XP-8.

If this works, it would be an easy way to control Apple Tv...

NO.
The video window might be a choice available, but only because the T4 and K4 share the same page sizes. You can only send video to a K4 through composite or S video, and as stated above converting video to ip, but even that can be tricky.
The XP-8 does nothing with a video signal to make it available to a T4.

The picture size can be re sized or as many would do with camera feeds, as an example, click on the image to go full screen.

There was a part that never came out that was called the EM-4.  It was a VESA mount adapter for the T4 that allowed a hardwired Ethernet connection and 2 composite video inputs.

Cool idea, but it never came to be...

Curious if you really processed this statement all the way through implementation? Think this through a little bit. Where would you connect the composite feed?