Windows operating system provide following enhancements to the old MS DOS operating system:
1. GUI capability: Windows is graphical user interface based system and it is user friendly.
2. It provides single user multitasking facility. User can open a number of windows and through each execute different task on time sharing basis.
Windows OS contain a cache manager that improves the performance of file based I/O by causing recently referenced disk data to reside in main memory for quick access and by deferring disk writes by holding the updates in memory for short time before sending them to the disk. Windows security references monitor enforces better security to the computer system than DOS. Windows support threads and symmetric multiprocessing.
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