Selecting MIMIC on rotary switch ``A'' allows the user to issue commands to the engineering MIMIC, a 4ms microprocessor which runs a schematic display of the state of the Cassegrain A&G box and ISIS. Commands are available to switch between the three display pages, to examine mechanisms in detail, and to issue network commands to move any mechanism in any subsystem (not just the ones on the display). These are detailed in a guide called `` The WHT engineering MIMIC'', which should be present in the control room.