The program, which downloads the pornographic material to the usurped computer only briefly to allow visitors to view it, is invisible to the computer's owner.
The software is undetectable by the system's proprietor and it downloads the pornographic material to the usurped computer only for a moment to allow visitors to view it.
Along with chipmaker Intel , the companies include Sony Corp. , Microsoft Corp. , Hewlett-Packard Co . , IBM Corp. , Gateway Inc. and Nokia Corp.