00100 The system command "ZERO DTA1:" causes the directory of 00200 the dectape mounted on DTA1 to be zeroed. Similarly, 00300 the command "ZERO DSK:" wipes out your disk files. 00400 In both cases you are asked by the program whether you 00500 are serious. An alternative way of wiping out your disk 00600 files is to logout using "K/Z".