There are two way to check.first is you can directly check whether key contain A or not in binding like this:-. but i think this is not the better way so instead of this you can use ko.computed to check.
Check for operating system information in Windows 7. 1  Click the Start button , enter Computer in the search box, right-click Computer, and then click Properties. 2  Look under Windows edition for the version and edition of Windows that your PC is running.
Step 1: Make sure your computer is eligible for Windows 10. 1  Windows 10 is free for anyone running the latest version of Windows 7, Windows 8 and Windows 8.1 on their laptop, desktop or tablet computer.2  You can figure out which version your computer by heading to Microsoft's website.lay. Windows 10 is finally here and it's the best version of the operating system we've seen in a while. Even better, it's a free update if you already have Windows 7 or newer. The new operating system is available as an update starting July 29 and we recommend you upgrade.