The company who develope the largest and more used pc operating system was Microsoft in 1981. By the time it was released it was useful, but they needed to create something more accesible. They did that with the addition of a graphical interface, which, although being something simple it was the revolution of the company whose software became the principal PC manager. In coming versions the advancements that they did where such as basic as menus, scrollbars, dialog boxes, and more importantly, the access to the interface with the mouse, but they where the ones which gave the coding a new face.