Three of biggest names in the PC industry have become embroiled in a patent row over the simultaneous broadcast of voice and video over data links. A company called Multi-Tech Systems is alleging that Compaq, Dell and Gateway have infringed its patents and is said to be seeking an unspecified sum in damages. According to the Dow Jones news service, Multi-Tech is planning to pursue other PC makers in light of the lawsuits issued the three PC companies, which were filed in the US District Court, Minneapolis, with a view to collecting royalties. ®