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.
1 Download updates for me, but let me choose when to install them. 2  If you select this option, Windows recognizes when you are online and uses your Internet connection to automatically download updates from the Windows Update Web site or from the Microsoft Update Web site. Start Microsoft Internet Explorer. 2  On the Tools menu, click Windows Update. 3  Click Yes if you are prompted to install any required software. 4  The Windows Update home page or the Microsoft Update home page appears. 5  Click Express Install (Recommended): High Priority Updates for Your Computer.