It might be a combined emulator/programmer. But if we just assume it's an emulator for now then I am afraid it might be useless without the correct software to run on a pc. To emulate I would expect that you would need to use a ribbon cable to connect the DIL slot on the emulator with the EPROM slot in the ecu. The PC would normally allow uploading of the code/data to the emulator and possibly 'on the fly changes'. The hexadecimal key pad would almost definitely allow changes to be made real time to tweak the fuel and spark etc. A photograph would be good to see.