It all began with an x86 based machine, form factor : ATX of course a desktop machine. In real life one starts small and grows big but related to technology it was the  other way round.
Some misinterpret software customization as mere customization of desktop which is also a form of customization but the real software customization is the Operating system that is customized based on the SoC like the one for GTA02  which includes the whole bunch of it like