Control Data Systems Inc’s separation from what is now Ceridian Corp is now complete, and shares in the spin-off have begun trading on a when-issued basis on the NASDAQ system – holders of shares in the former Control Data Corp won’t get their certificates, one Control Data Systems for every four Ceridian that they hold, until August 31; Control Data Systems Inc has also now finalised its agreement for Silicon Graphics Inc to take 10% of the enlarged equity in the company, getting one seat on the board, to be taken vice-chairman Mark Perry.