Do you know about online virtual operating system? most probably many company’s provide virtual operating system to their clients for money. Windows4all a website which provides virtual Windows operating system for free.

Windows4all is a Microsoft Silverlight based online virtual operating system, it simulates an operating system inside a web browser. Windows4all.com replicates the desktop environment of a modern operating system. The user can launch applications right away without installation.

Windows4all is web-based and requires Silverlight 2 to operate. currently it includes desktop, taskbar, start menu and sidebar with applications like

• File Explorer
• Internet Explorer
• Video Player
• Rich text editor
• RSS reader
• Notepad
• Paint
• Calculator
• Games like Chess, Solitaire, Spider, Tic-tac-toe

The system also supports installing program functionality. But this program should be developed in Silverlight and have valid URLs for the xap file.