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@Ever the time machiene has to be programmed to go to the specific timeline and time etc. So basic knoledge of how it works is required. Also you have to understand how to refuel it, make specialized fuel, maintenance often etc. which Cell clearly was planing to do as he wanted to travel to alternate timelines indefinatly, and you can only travel a couple times on one fuel cell. Also he has extensive databanks on Trunks, the machiene etc from monitoring with Geroe's computer bugs that gather DNA and data for him while being created.