DOS.
For IBM-compatible PCs, the aboriginal operating arrangement was Microsofts deejay operating system, or DOS. IBM apprenticed with the thenstartup Microsoft aggregation to accumulation the operating arrangement for the antecedent IBM PC; Microsoft purchased the absolute QDOS (Quick and Dirty Operating System) from Seattle Computer Products and acclimatized it as all-important for the new computer system. [...]

User interface. Windows’ user interface is the allotment of Windows that you, the user, sees and with which you interact. When you bang an onscreen button or columnist a key on the keyboard, Windows translates that activity and sends the adapted instructions to the computer’s anamnesis and microprocessor. Windows Vista presents a graphical user interface [...]

Here are some list web 2.0 you can use to create your website or blog theme, button, css style, background, corner image, etc….