The OS provides many ways in which the programmer can intercept and modify its operation, simplifying the task of modifying its behaviour: either in the GUI or deeper.
The OS provides many ways in which the programmer can intercept and modify its operation. The OS provides either in the GUI. The OS provides deeper. The OS is simplifying the task of modifying its behaviour: either in the GUI. The OS is simplifying the task of modifying its behaviour: either in deeper.