This cable is primarily used for connecting video projectors with Component-in capability through it's VGA port. It can only function with a VGA port that is either able to recieve or transmit Component signals (Y, Pr, Pb).
If connecting from a PC with VGA graphics card, the projector / HDTV you connect to needs to support VGA (RGBHV) signals on the component / YPbPr input if you are using a standard graphics card which outputs VGA (RGBHV) signals only. Most projectors do support this on the VGA / D-Sub input. Check your manual to confirm.
THIS CABLE WILL NOT ALLOW YOU TO CONNECT YOUR COMPUTER'S VGA PORT TO THE COMPONENT INPUT ON YOUR HDTV unless your video card supports component out function through it's VGA port or alternatively the HDTV / projector supports the VGA signal on component input as mentioned above.
IT WILL NOT ALLOW YOU TO CONNECT YOUR COMPONENT VIDEO SOURCES TO A REGULAR COMPUTER MONITOR OR HDTV unless you monitor specifically has this capability. Most do not. (Please check the documentation for your computer monitor)