High Quality Content by WIKIPEDIA articles! Commodore named their Amiga computer`s first operating system Workbench 1.0 and continued with the Workbench name until version 3.1, when it was changed to AmigaOS, prompted by Apple renaming their propriety OS from "System" to "MacOS". Subsequently the Amiga computer used the name Workbench to refer only to the native graphical interface file manager and application launcher of the Amiga`s operating system typically presented to users upon booting the Amiga. In that regard the Workbench GUI component was not required to boot the Amiga or run other applications, but was a standalone application listed in the startup-sequence script.